Check Engine Light and Erratic Gauge Operation on GMC S15 Jimmy

The electrical contacts in the ignition switch may fail and result in erratic instrument panel gauge operation or illumination of the Check Engine Light. A failed ignition switch will require replacement.

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Average mileage: 150,000 (150,000–150,000)
2 model years affected: 1990, 1991
3 people reported this problem
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problem details
1991 GMC S15 Jimmy 150,000 mi,
Car stalls at idle or high speed. replaced fuel pump, catalytic converter, fuel tank, etc... Still stalls but starts right up again.