Question about 2001 Pontiac Grand Am SE

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Ruff idle below 800 RPM

I have just replaced everything in the timing, and installed new plugs. Above 800 RPM runs great, great power no problems on the road or highway had the codes checked and got code 300 random multiple misfire. Installed new air filter as well. Any sugestions?

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Did you time the gears?

Posted on Feb 04, 2009


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Periodically, EPS comes on Dashboard ,then steering becomes too hard, this will disappear two to three times re start the vehicle or running few meters and switch off the car and re start the car.

well I can't drive it and see all symptoms.
i can't see the idle speed drop below 800 RPM,. !
if the idle drops real low, then engine shakes, and PS gets weaker.
Id ignore the EPS till such time as all other things are perfect.
ever get an engine tuneup this decade?
low engine RPM , top number 1 cause is owners not servicing their cars. (spark plugs bad tops that list)
if you ignore that, tuneup the engine WILL misfire and RPM will drop and P/s (means power steering)will get weak (the assist is pump driven) and then the engine can stall.
i bet you also forgot to say the steering got weak
park or coming to a stop with foot off throttle.
do the head lights dim as this (bad) happens?
can you use your right foot to keep RPM above 800 and save stalls or near stalls?
IF RPM is ok, ?then check the fan belt next. (slips)
or buy a new on, my guess is 11 year old belt is kinda hopeless case.

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