If engine idle rolls up and down, and diagnosis rules out Idle Air Control (IAC) valve issues and vacuum leaks, the Programmable Speedometer/Odometer Module (PSOM) can be at fault electronically. The instrument cluster will need to be replaced, the PSOM is inside the cluster.
Engine Idle Rolls Up and Downon Ford E-150
Average mileage : 120,000 (120,000–120,000)
EnginesAffected: = affected_variants_list(car_problem_description)
4 people reported this problem
1 person shared problem details
The engine would randomly 'race' without warning. I would have to keep foot on brake at stoplights etc. to keep it from 'jumping out' into traffic. We tried vacuum hoses, egr valve. Doing it again.
Sludge build up on the throttle plate and/or idle air control valve can cause a poor engine idl...
my ford van when driving down the road at high way speed,it will jerk in and out like its cutti...