The truck idles up and down and when slowing down to stop it stalls but only after truck is at full operating temp. I replaced the idle position sensor but that made no difference.The solinoid on the drivers side of the throttle body which i belive is fast idle at start up fluctuates in and out during rough idle.If i unplug this four wire harness going to the solinoid it seems to run fine and won't stall but i have no fast idle at startup.
Here are the most common causes of idle surge, rough idle esp when cold and 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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expedition stalls when slowing down already changed maf sensor,dpfe and throttle body position sensor
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