Engine Idle Rolls Up and Down on Ford E-350

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.

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Average mileage: (–)
2 model years affected: 1992, 1993
2 people reported this problem
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