Have a load test done on the battery for failing cell and have the output of the alternator checked as if the battery is faulty then the alternator has trouble supplying enough current to run every thing electrical
Testimonial: "Thanks Bill...the problem comes from somewhere else it had new battery, alternator checked ok, BCM changed ..."
SOURCE: erratic idle speed
Have the fuel pressure checked. Could be an erratic pump or pressure regulator.
Poppascott
SOURCE: 2004 Buick Rainier, vortec 4200
may be intake manifold leak also check fuel injectors they may be clogged
SOURCE: The car periodically stalls out
1 Inspect Carburetor Dirty and Improperly Functioning Carburetor. 2 Inspect Carburetor Incorrect Carburetor Adjustment. 3 Inspect Carburetor Worn, Faulty or Damaged Carburetor.
SOURCE: HI, MY CAR START AND 2 SECONDS LATER DIES,,, THIS
bad fuel pump, bad relay, bad crank sensor, bad ignition module. Being a 13 year old car it could be anything. To start with you need to check for codes the same day this happens.
Testimonial: "THANKS"
SOURCE: Car stalls on occasion, usually
Hello
This problem is in most cases caused by fuel residue sludge building up inside a little valve that controls idle speed, the symptoms are stalls when coming to a stop and other things like idle speed goes up and down (idle surge) and hard starting, I would like you to do a complete cleaning of the Idle speed control valve and the throttle inlet blade, it should cure the problem. Please follow the instructions exactly or it will not work. Here is the procedure I use at work to correct this.
To correct this problem I want you to get a can of intake cleaner (ABOUT $5.00) from any local auto parts store like NAPA or Carquest, do not use carburetor spray, intake cleaner only or u will damage the Teflon coating inside the throttle valve and air bypass valve, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
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