95 gt rough idle and bucking issue - Mustang Evolution

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Old 01-11-2012, 06:50 PM   #1
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95 gt rough idle and bucking issue

About a month ago I traded my 1996 v6 for a 95 gt. I did basic tune up( plugs wires coil etc..) but for some reason when it idles the rpms will go up and down and will sometimes go so low the car stalls. Then when I drive at low rpms it will buck. However at higher rpms it runs fine. What could be causing this?
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Old 01-11-2012, 06:56 PM   #2
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Dirty IAC, dirty MAF, TB could be hanging up. If the car has mods, 94-95 5.0L are sensitive to mods like cam and intakes. Was it acting this way before the tune up?
Also may be timing
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Old 01-11-2012, 07:06 PM   #3
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Yes it was like that before tune up. MAF has been cleaned and it has a bbk CAI and smog pump delete. The timing was off but it was fixed during tune up. We also pulled the upper intake manifold off and cleaned it, replaced all vaccum lines, and cleaned the egr valve.
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Old 01-11-2012, 07:35 PM   #4
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dirty iac sounds reasonable.this problem seems to be a pretty common problem in these cars.there is a good write up in the : stickies-useful mustang info sites- surging,hanging idle.
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Old 01-11-2012, 07:44 PM   #5
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I replaced the iac when I did tune up
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Old 01-11-2012, 07:49 PM   #6
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Did u check the other things that dead mentioned.also if u have a air filter that needs oiled sometimes they get over oiled and the oil can get on the maf.or oil from your skin if you've handled the maf.
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Old 01-11-2012, 07:59 PM   #7
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Yes. I've checked Everything but just can't figure out what it is
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Old 01-11-2012, 08:05 PM   #8
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Quote:
Originally Posted by Napoleon
Yes. I've checked Everything but just can't figure out what it is
Also try setting/checking your tps.
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Old 01-11-2012, 08:36 PM   #9
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I tested its resistance to make sure it was working properly, which it is
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Old 01-11-2012, 08:37 PM   #10
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Re: 95 gt rough idle and bucking issue

Check for vacuum leaks.


Did you apply vacuum to the EGR when you had it off to ensure it works?
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Old 01-12-2012, 07:53 AM   #11
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We replaced all the vaccum lines so there is no leaks. No didn't test egr just hit with alot of carb and choke cleaner
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Old 01-12-2012, 11:55 AM   #12
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Re: 95 gt rough idle and bucking issue

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Originally Posted by Napoleon View Post
We replaced all the vaccum lines so there is no leaks. No didn't test egr just hit with alot of carb and choke cleaner
Just because you replaced all of the vacuum lines does not mean that you cannot or do not have any vacuum leaks. Vacuum can leak from any vacuum powered accessory such as the EGR diaphragm, a myriad of other vacuum controls and from your intake itself.


Not 100% sure if any of yours are, but some heater/A/C controls in the passenger compartments are also vacuum powered and it can leak there too.
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Old 01-12-2012, 06:49 PM   #13
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Ok I'll have to check that. Thanks
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Old 01-13-2012, 08:59 PM   #14
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I have been having problems with my 94 for about 3 weeks also, when u cleaned the egr valve did u take it all the way off or was it still on. I have been replacing things here and there now i am looking at the egr pressure sensor and vacuum solenoid but not sure where to find them in the car
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Old 01-14-2012, 09:30 AM   #15
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I have a 95 and it's in the fender. You can change it with out taking he fender off but u need t remove the inner fender . Harder to see bit much easier then taking the fender off
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Old 01-16-2012, 05:09 PM   #16
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Re: 95 gt rough idle and bucking issue

Today i was playing around with my engine trying to find my problem so I disconnected the vacuum line going to the egr valve. Took it for drive and finally it drove smooth. However now it has trouble starting and threw a code. What do i need to do?
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