1994 gmc cuts out at 55mph

Asked by 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

113,655

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

113,655

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

its more of a backfire and missing than a stall.

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