#13: Slow change in MAP from start to run. Basicly, the PCM didnt see a significant change in the sensor reading from when the truck was starting to when it was at idle. Its on the firewall just to the drivers side of engine, has a vacuum line and an electrical connector. Check vac line for blockage or being pinched or disconnected. Most likely is a failed sensor. If your able to, check for 5volts on pin 3 (violet with white stripe) and ground on pin 1.
93 Grand Wagoneer (de-wooded) 5.2 Mag, 2"BB, Magnaflo Cat, Gibson ex, K&N CAI, Mopar pcm, 32" BFG AT, Accel truck ignition