Dies when approaching stop signs or slowing from highway speeds. Idol goes high then you can stop and start to resume normally. Replaced vaccume lines, upper intake gasket (properly), cleaned throttle body off of the car and replaced gasket, new wires and plugs. fuel pressure at 40lbs. Should I try idle speed control valve? Not sure what else it could be. Thanks!
Deej
My son had the exact same problem on a 93 Buick LeSabre. The crank shaft sensor was replaced for about 60 dollars and has not had the issue for over a year.
Did you clean the idle speed control air bypass valve?, u do this by spraying carb spray into the intake while the engine is held at hi idle so it won't stall, use up about half the can, then shut down and disconnect battery for 5 minutes to reset system idle learn, drive the car for a few days and let me know if the problem is fixed.
Here are the most common causes of idle surge, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, 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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