My 94 buick park ave has been stalling at low rpms. i have chaged the fuel filter, air filter, oil and oil filter, spark plugs and wires, cranshaft position sensor and i have been using additives to clean fuel injectors but still idle is rough. thinking it may be the EGR PCV or IAC. also my battery light comes on but the needle is in the higher area. any help or ideas?

Take the iac out and try cleaning the cone and where it seats in the tb with tb cleaner. did you see any corrosion on the coil terminals when you changed the wires? you could check the tabs on the icm sometimes thats corroded too.

Are you getting any DTC'*?

If not I'd inspect all soft vacuum lines, my 96' PA had a few that had dry-rotted after 15 years, one in the back rear underside of my car (the fuel vapor EVAP line) even disconnected from being so dry-rotted.

If you do not find any dry-rotted hoses I'd get some MAF cleaner and clean that MAF off, if the MAF'* thermistors are a bit dirty it can read a little low, which if it reads too low at idle it can stall, because it will be starving for fuel.
While cleaning the MAF you may as well replace that air filter, if you have not done so recently.

Have you tested your fuel pressure?

coils are perfect, cleaned maf, going to clean iac and egr today. did not test fuel pressure, not sure how to, i will look at the hoses today also then. would maf cleaner be ok or carb cleaner for the iac?

Carb cleaner is ok for the IAC considering its carbon you need to remove. Its not advisable to use it on MAF sensors. Use MAF sensor safe cleaner. Usually located on the same shelf as the carb cleaner.

My first thought was vacuum hoses, you might want to check your battery terminals for corrosion and tightness. Also it maybe time for new battery cables altogether, I changed mine and it made a world of difference.


98 SLE