98 D 5.2 High Idle 2100 rpm

98 durango 5.2 At first it would not idle. Replaced the IAC valve. Fixed for two weeks. Drove to the store, took this one off and got a new and replaced it in the parking lot. Idling at park 2100, drive 1100. Went back and had codes read. po108 MAP sensor voltage hi
po123 TPS voltage hi
po113 Intake air temp voltage hi
po505 IAC motor circs
What would cause all of these sensors to read hi? I went to the local junk yard and got a complete throttle body with the map, tps, iac on it off of a wrecked 5.2 durango. Put this one on. Same problems.

All these sensors except the IAC share a common sensor ground. The wire is black with a light blue tracer it is the sensor ground wire and is spliced at a couple different places in the harness. This wire also goes to the clock spring for the air bag. You could possibly have a shorted clockspring causing your problem or a wiring issue in the eng compartment. All these codes at one time and you have to look for a common cause. These are 2 possibilities.