In a nutshell...Choke valve, linkage and fast idle cam must operate freely. A non-functioning idle stop solenoid (if equipped) could cause stalling or rough idle. The reason why is that it minimizes strain on starter and battery and reduces the possibility of backfiring when attempting to start the engine. Check to see if it is equipped with the above Solenoid and the other three items are in proper working order. If this doesn't help we go to the next steps.
SOURCE: 1991 Olds Bravada 4.3 v6 rough idle and backfiring.
Ok guys, let's fix these things here!
Just went through this myself, so do the following:
Go to your local parts store and buy a Haynes Repair Manual.
You need to read the book first, learn how the ECM (Electronic Control Module) works. You'll see that there are alot of sensors and components that make up the fuel emissions bologna.
The nice thing about this system is not only does the ECM control all electrical functions, it also trouble-shoots it's self. When a component or sensor goes out, the ECM stores a code for that event in it's memory. You can use the Haynes Repair Manual to put the ECM into diagnostic mode and thus read any codes present.
So, all that's left is replacing what the EMC tells you too! :) Good Luck!
SOURCE: 1994 pontiac transport se not firing in first coil pack at idle
ARE YOU CHEKING SPARK OFF THE COIL TOWER OR AT THE SPARK PLUG END OF THE WIRE SOUNDS LIKE YO HAVE A BAD WIRE
SOURCE: I have a 97 pontiac sunfire 2.4l it has no power
Liquid meaning water in cylinder #1? Blown head gasket.
SOURCE: 1988 Jeep Wrangler starting problems. I replaced
you are saying it is getting spark, and fuel, right? If it is getting spark, and fuel in to the throttle body, check compression-make sure the Mass Air Flow sensor is plugged in, and double check your spark-you say you replaced all those ignition items, but do not say that you have spark.
SOURCE: how to fix 2002 pt cruiser rough idling
Check on intake silicon gaskets, upper and lower. About $18 at autozone
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