Yes the mechanic is correct, the idle is maintanined by the on board computer, it should never be adjusted, if the engine is running slow or stalling at idle then u have a sludged up idle speed control system valve, here is how u clean that.
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.
maybe the mechanic's correct, but even after I cleaned my intake and still was too low, (dying,) I turned up my idle a little. It took a torx driver, only turned a little, solved, runs and idles fine now.
by resetting the throttle position plate "hard Stop" u have thrown the TPS (throttle position sensor) voltage off and other things as well, u should never adjust the screw.
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