Truck starts fine but stumbles at idle and stalls out whenever i give it any gas. This happened over night yesterday. I've changed plugs and wires and checked all the coils. I've changed MAF sensor. Checked oxygen sensors and cats are good. OBD codes 102, 171, 174, 300, 327 and 1514. Codes 171, 174 and 327 have been there for months. The others showed up yesterday when this problem appeared all of a sudden. A mechanic friend sugguested that the throttle position sensor might be bad, but i found that the truck doesn't have one. could the acceleratoe pedal position sensor casue the same problem? Any help?

sounds more like the air idle speed motor, or some call it the idle air control motor. locate it. should be somewhere on the throttle body. unplug it, and check pins on the sensor it self and see if it plugged in tight, if so, removed the motor itself. it should be nice and clean. if its all dirty with carbon deposits, looks like soot in a fireplace, use some brake and parts cleaner and clean it up real good. while cleaning, check the spring on the pintle (the part that moves in an out) if its broken, this could be the reason it would idle as it has no way to control incoming air to the throttle body. id start with that first and go from there... sounds more like the air idle speed motor, or some call it the idle air control motor. locate it. should be somewhere on the throttle body. unplug it, and check pins on the sensor it self and see if it plugged in tight, if so, removed the motor itself. it should be nice and clean. if its all dirty with carbon deposits, looks like soot in a fireplace, use some brake and parts cleaner and clean it up real good. while cleaning, check the spring on the pintle (the part that moves in an out) if its broken, this could be the reason it would idle as it has no way to control incoming air to the throttle body. id start with that first and go from there...