Rpms are jumping anywhere from 200 - 1200 constantly up and down, making car die. I have to put car into nuetral and press on gas to keep car alive. I have changed the fuel filter, air filter and spark plugs. Checked everything for spark and everything seems fine. I scanned the car and i got an error code saying "random cylinder misfire" please help
Don't let the rpm below 450. The oil pressure build by the oil pump is insufficient. Engine breakdown will do.
This is a dead ringer symptom of a vacuum leak
SOURCE: wont keep idle, car stalls out
I had this same problem on my 2005 monte carlo, took mechanic a while to figure out it was the idle air control valve. They also replace the idle air control motor.
SOURCE: car randomly dies at stop lights
That would be a vaccum leak somewhere along the system. Listen for a whistle if you can hear it. Hard to say where your problem lies but it is a vaccum leak.
SOURCE: 1998 Monte Carlo (Z34) stalls when braking/RPMs rise then drop
ON THE SIDE OF THROTTLE BODY IS THE IDLE AIR CONTROL MOTOR GENERALLY HELD IN PLACE WITH TWO TORK SCREWS REMOVE SCREWS AND SLIDE OUT OF THROTTLE BODY THERE IS A PLUNGER ON END OF IAC MOTOR CLEAN IT GOOD AND THE SEAT UP IN THE THROTTLE BODY AND RE-INSTALL THIS MAY HELP TO ALLEVIATE SOME OF THE FLUCUATION IN RPM,S CLEANING CAN BE DONE WITH CARB SPRAY AND A OLD TOOTHBRUSH
Testimonial: "The info on my idle speed control was correct, it was broke beyond repair. Replacing it fixed it for a whole 20 minutes. After that I changed the EGR Valve and the Mass Air Flow Senser. Everything runs fine now -no stalling."
SOURCE: Over past few months occasioanlly while driving,
When was the last tune up? Check oil level also. Try using some chevron techron to clean the system out. Filter is pretty cheap so replace that also if its never been done.
SOURCE: my 1997 monte carlo z34 3.4 engin is holding high rpms
I had a similar problem on a 3.4 Lumina Z34. It was a leaking intake gasket. Be careful with the plastic vaccumn lines as they will get brittle.
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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