When it's cold, I get about a 2-300 RPM varience (settles down, pops up, settles down, pops up, 5 second cycle or so). After it warms up, steady as can be.

Any suggestions?

-Reno

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89 Formula 350
"This is how you remind me of what I really am..." - Nickelback

 

check the temp sender going to the ECM. Its located in the front of the base.

Mine would idle irradcally until it warmed up, that was the problem, the sensor was on its way out.

John

 

The front of the base? You mean the intake manifold?

Jon

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89 GTA
Beautiful Gunmetal gray, LB9 305 and T5 tranny. Only 60,000 miles!
Dual cats, 3"flomaster
Accel 300+ Ignition, wires, cap, coil, etc
Airfoil
KN Airfilter
Removed Screens on MAF
SLP 1 3/4 headers
No Smog/AIR system

 

yes, its located in the front of the intake manifold, however, iv heard of a slight intake leak or gasket leak could cause ur symptom, when the engine heats up, the metal expands and kinda seals up the hole.
have u checked ur vacuum?

the CTS could also very well be the problem, id check both.

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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series

http://www.geocities.com/david_angel_16

 

here's where I suck... What's a CTS, and what SHOULD my vacuum be at idle?

-Reno

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"We are the middle children of history. Our Great War is a spiritual war, our Great Depression is our lives" - T.D.

 

CTS coolent temp sensor. vacuum, im not sure about, mine is around 19" i think, just check it when u first start it, and when its warm and compare.

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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series

http://www.geocities.com/david_angel_16