1998 GMC Jimmy once in while shuts off when shifted in park

1998 GMC JIMMY
125,708 MILES
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ROYCAR71
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  • 359 POSTS
I recently had po452, po171, po174. I had fuel pressure sensor and elbow on top of intake manifold pleumn from pcv valve replaced. I took off Mass Air flow Sensor and cleaned with CRC MAF spray. No CEL shows now. But on occasion I get little hesitation when I step gas and truck shuts off when I shift gear into park. It will start up and drive ok other than earlier mentioned hesitation.
Sep 15, 2013 at 6:48 PM
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ASEMASTER6371
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171,174 can be caused by vacuum leaks, pcv valve, mass air flow failure or low fuel pressure. mass air flow cleaners have little or no effect. assuming you cleared the codes, they will return after failing 3 drive cycles if there is still an issue. you need to monitor the long term fuel trims to diag the failure.

as far as idling, it could be a vacuum leak, throttle body or idle air control.

Roy
Sep 21, 2013 at 2:11 AM
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ROYCAR71
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Currently, codes have not returned. I still get the occasionally abrupt shut off when shifting to park.
Sep 27, 2013 at 1:49 AM
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