I was having a problem with hesitation. I tried at least ten times to reset IAC according to the tech article along with timing and TPS adjustments. No matter what I did, the engine loped at idle and hesitated like a mother****er. I raised the idle rpm's after bypassing the IAC as instructed but when the bitch was plugged back in and controlled by the computer once more the idle rpm's would just go WAYYYYYYYYY back down and hesitation on acceleration was the result. I just unplugged the IAC last night and drove around for a while. No hesitation. No engine codes. No more pain in the *** .

 

maybe you have a vacum leak. my car did that when my thermac vacuum cap fell off.

 

My car has been suffering from stutter problems off idle, it just "shimmies" till I reach higher rpms then it smoothes out explain that.
I thought I would give it a try, unplugged the iac and engine now idles at 2,000rpm so I plugged it back in. Yours do that speedlvr? Maybe if I would have drove it I could tell more?

 

No vacuum loss anywhere. All areas were checked.

My car was just shimmying off idle too until highr rpms. I tried EVERYTHING and nothing has fixed the problem except unplugging the IAC. Car idles at around 1500. But I can live with that, I can't live with that hesitation ****. I think of hesitation as a postponed ejaculation when you really wanted it RIGHT THEN!

 

Can anyone guess what the real reason is our cars are stumbling, just for curiousity sake.

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• 412ci/sb

My Homepage

 

Try new 8mm wires. That's what cured my problem. If a wire is bad your plugs won't fire under idle so try that. Most parts stores will let you return them if they don't help. Another thing you might want to get checked out is the distrib cap. Get new points etc and try that. Pull a couple spark plugs and look at them after you've let the car run like crap. Don't pull them out after it's been sitting for a while, that doesn't help as much. Tell us what they look like.

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, Jon (350 TBI! getting 23mpg highway)
91 Red RS w/grey int, sq stereo (Alpine v12, kicker solo, MB quart premium etc)AIM: JPrevost

• Holley 670 TB unit w/ 1/2" spacer/adapter
• Edelbrock RPM vortec intake
• 350ho 330hp vortec crate motor
• 8" harm. balancer
• Stewart stage 2 water pump w/160 thermo
• SLP tri-y headers to full 3"
• Rebuilt trans w/ SLP shift kit
• Centerline 16x8's all around
• 36/24 mm sway bars
• Full poly bushings, even motor mounts
• SLP LCA and panhard
• Alston SFCs
• Edelbrock 3 point STB
• Global west steering brace aka wonderbar
• Eibach pro kit springs
• Bilstien high perf. struts and shocks
• All this and I still have AC

My websiteAny questions?

 

A malfunctioning IAC is a vacuum leak. My camaro(TPI) did that until a few weeks ago, popped in a new IAC. Fixed it right up. I cost $25.

 

I got a brand new IAC and it just did'nt do a thing for it and I have 8mm wires and the dist cap is fine. All wires are new and all plugs are new. IAC is not needed for my car so f*ck it. Thanks very much for the info. I DO wish it would have worked but my brain was warped after trouble shooting for 3 months. Praise the Lode! It's fixed.

 

ya its fixed. till what really caused the problem causes more.