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Old 01-09-2013, 12:31 PM   #1
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idle probs / throttle lag

Hola!

I'll get right to the chase:

125k, all stock other than CAI, shorty headers

1.) I start the car after it's been sitting for long enough to get cold ( hours / days ), and it'll go up to about 100o rpms and immediately die. It'll do this repeatedly if I don't give it gas ( sometimes it'll still die with the extra gas), holding it at about 1500-2000rpm. Then once i let off the throttle, it'll start to "search" for idle, 1200 to ~500 then to (higher) 1300 to 400, high, low, high low, then dies.
Even after driving around for about 5 minutes, if I put the clutch in, and leave in neutral it'll rev down and die.

2.) I'll shift into 2nd from 1st while accelerating (it also does this if I slow down in 2nd, and get back on the throttle EX: turning a corner, and then speeding up), give it moderate to heavy throttle, and it'll sort of bog down / lag several times, each time getting shorter in duration until it starts speeding up.


Any ideas??? Please???

o2 ?
maf ?


I checked the salt n' pepper shakers. they are fine
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Old 01-09-2013, 12:40 PM   #2
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Have you checked your TPS voltage? What about your plugs, wires and distributor cap? Check those first. My car used to stall if i put the clutch in or was just sitting in neutral and i just bumped the idle up a little bit and it cleared right up, idles at 900rpms now.
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Old 01-09-2013, 01:38 PM   #3
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I had that happen to me and turned out to be a bad fuel pump and regulator
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Old 01-09-2013, 02:06 PM   #4
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Two words : Check Timing.
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Old 01-13-2013, 11:46 AM   #5
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+1 I just bought an 88 gt and I had the same problem, timing was way advanced.
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Old 01-13-2013, 02:38 PM   #6
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If you live near Milwaukee and need a timing light I just bought one
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Old 01-18-2013, 09:11 AM   #7
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Culd be pad fuel pump or naybe jus as simple as dirty injectors. I had a cherokee do ttha same thing an it jus needed a good injector an fuel system clean. But not with tha crappy stuff u jus pour in the tank. Jus actualy cle them an the throttle body
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Old 01-18-2013, 04:17 PM   #8
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Thanks for the advice guys. It seems like the consensus is in this order:
Timing, fuel pump, fuel injectors.

I may try and adjust the timing. A good google around may teach me how to do that.

Since the fuel pump, and injectors haven't been touched since they were installed in 1989..... if I start to look at those, I might as well upgrade them a little bit!

Are the fuel pumps in these cars INSIDE the tank? If so...
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Old 01-18-2013, 06:08 PM   #9
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Yes it is in the tank. I would change filter and check fuel pressure before pulling it out.
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