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Old 03-17-2014, 12:36 AM   #1
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97 gt not idling right

This problem just started happening and it's getting annoying.so today I changed the throttle position sensor and it gave me great smoother acceleration but after a while of driving it it started doing it again.So after that I also changed the the idle air control valve and no luck:/
What can it be.
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Old 03-17-2014, 12:42 PM   #2
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Update this just started happening.I was parked and I revved my engine the Rpms went up as normal but when they came down my car turned off as if it was stalled.
I recently change my mufflers from flowmastes to regular stock 99 gt mufflers.can this be a problem that they weren't welded on right?
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Old 03-17-2014, 03:47 PM   #3
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When you changed the IAC and the TP sensor, did you disconnect the the battery to clear the memory of the computer? It helps speed up the idle re-learn process tremendously when replacing faulty sensors and such.
Disconnect the battery for a half hour, preferably, when the engine is cold. Re-connect the battery and start the car, then just let it idle for about 15 minutes, or until it comes up to operating temperature. Then drive it around for 10 or 15 miles.
I assume that all of the tune-up items, filters, plugs, wires, etc. have all been checked and both the MAF sensor and the throttle body have been cleaned as well.
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Old 03-17-2014, 08:30 PM   #4
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I haven't done that Im gonna have to do it.But would does problems above cause my car to stall when I rev while in park?
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Old 03-17-2014, 08:43 PM   #5
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Possibly the computer hasn't re-learned the idle. Try the battery disconnect procedure first and if that doesn't work we can diagnose it further.
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Old 03-18-2014, 12:04 AM   #6
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So I disconnected the battery let it sit for a bit and the car stalled after I revved :/
Auto zone told me I might of got a defective iac so ima have to exchange it and hopefully that solve the problem.
As for the exhaust question I just recently had my mufflers changed and I was thinking maybe I had a leak that's why it stalling.
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Old 03-18-2014, 12:23 AM   #7
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Haha.
You were reading my mind about the IAC. This is the second thread recently about a bad IAC from AutoZone. Make sure to get one that's made by Hitachi this time. Then do the battery disconnect thing again. Do NOT touch the throttle until the engine is at normal operating temperature.
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Old 03-18-2014, 12:25 AM   #8
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Lol
Luckily it's just a quick swap.after changing my tps my car ran really good but still roughy idled then after changing the iac it will die when I rev at park.also my car feels to accelerated is that also controlled by the iac?
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Old 03-18-2014, 12:28 AM   #9
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Yes.
All of that is controlled by the IAC.
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Old 03-18-2014, 05:00 AM   #10
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So I took my new tps out and luckily I still had my original one hooked it back on and problem solved!
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Old 03-18-2014, 08:16 PM   #11
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Idle Air Controller (IAC)

About $100 and 5min to swap
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