88 5.7 tpi bouncing idle and stalling
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Junior Member
Joined: Jul 2010
Posts: 30
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From: RI
Car: 88 iroc-z 350 tpi
Engine: 350 tpi
Transmission: 700r4....for now....
Axle/Gears: 9 bolt 3.27
88 5.7 tpi bouncing idle and stalling
Hey guys,
I have an 88 5.7 that has recently began acting quite strangely recently. When I first start the car cold, it will start right up, but after the idle settles down a little, the idle speed will bounce between about 400 and 1200 rpm. This will happen endlessly until I start to drive the car. Under acceleration above 1000 rpms, the car runs really well, but when I lift off to change gears (t5 swap a few years ago) or let off to come to a stop, the rpms plummet to almost 250 rpm, then slowly the idle will come back up to normal (700ish) after about 10 seconds
I have an 88 5.7 that has recently began acting quite strangely recently. When I first start the car cold, it will start right up, but after the idle settles down a little, the idle speed will bounce between about 400 and 1200 rpm. This will happen endlessly until I start to drive the car. Under acceleration above 1000 rpms, the car runs really well, but when I lift off to change gears (t5 swap a few years ago) or let off to come to a stop, the rpms plummet to almost 250 rpm, then slowly the idle will come back up to normal (700ish) after about 10 seconds
Senior Member
iTrader: (3)
Joined: Jan 2012
Posts: 877
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From: Clark NJ
Car: 1988 Pontiac Transam GTA Notchback
Engine: 2003 Chevy 5.3 Vortec (325 cu)
Transmission: 4L60E
Axle/Gears: 3.27
Re: 88 5.7 tpi bouncing idle and stalling
I second IAC, could also be spark related
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