1994 gmc cuts out at 55mph

Asked by 62jimmy Sep 13, 2015 at 11:13 AM about the 1994 GMC Sierra 1500 C1500 SL Standard Cab SB

Question type: Maintenance & Repair

engine runs fine when parked will rev to red line in 1st, 2nd, but when it reaches 50mph in 3rd or 4th it cuts out and won't run.

3 Answers
189,525

Paul answered 9 years ago

Take a look a the Crank Shaft Sensor...http://troubleshootmyvehicle.com/gm/4.3L-5.0L-5.7L/how-to-test-the-crank-sensor-1

Mark helpful
189,525

Paul answered 9 years ago

You may also want to check PCV valve, O2 sensor and catalytic converter, check and clean the throttle body..

Mark helpful

Your Answer:

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