1998 Chevy Silverado cutting out

1998 CHEVROLET SILVERADO
187,000 MILES • V8 • 4WD • AUTOMATIC
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MIKE15
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  • 5 POSTS
I've replaced the spark plugs, spark plug wires, disteribauter cap and rotor, my truck will start but then dies like you turned the ignition off. then ill be driving down the road and it will start cutting out, the rpm gauge drops and the vehicle feels like its chugging, fuel pump works fine, then ill pull up to a stop light and it dies again so i start it and its fine but then does it again. just looking for some thoughts on what it could be thanks
Sep 25, 2010 at 4:36 PM
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JACOBANDNICKOLAS
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Have you actually checked fuel pump pressure? Also, has the check engine light ever come on?
Sep 25, 2010 at 5:21 PM
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MIKE15
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no i havent checked the fuel pump pressure, and the check engine light is on
Sep 26, 2010 at 1:17 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
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Start with the check engine light. Have the computer scanned to see what trouble codes are stored. Most parts stores will do it for free.

Have that done and let me know what you find.

Joe
Sep 27, 2010 at 12:27 AM
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MIKE15
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had that done had to replace egr, throttle posotioning sensor, mafs, and gas cap, fuel pressure is good, still giving me problems mafs reading is erratic now according to a scanner. could it be i got a bad one or wiring harness?
Sep 27, 2010 at 11:39 AM
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JACOBANDNICKOLAS
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It could be either one, wiring or part. Since the part is most likey still under warranty, I would try to replace that first before tracking a wiring issue.
Sep 28, 2010 at 12:33 AM
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MIKE15
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i replaced the mfas so it must be a wiring issue, would it be the harness that plugs into the mfas
Sep 28, 2010 at 10:50 AM
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MIKE15
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could it possibly be the ecm or computer, or the camshaft position sensor thats where the wires go to
Sep 29, 2010 at 1:21 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Something tells me that it deals with the wiring. The PCM could be bad, but I doubt that is the problem.
Oct 1, 2010 at 2:48 AM
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