2000 Chevy Silverado Hesitation Off-idle

Tiny
QUAGMIRE86
  • MEMBER
  • 2000 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 117,000 MILES
I've had my truck into a mechanic twice now and still have the same problem. I have a pronounced hesitation/backfire from "Off-idle" until it goes into second gear. It doesn't do it everytime, but mostly when engine is cold (sometimes when engine is hot too). I've replaced the fuel pump/sending unit, filter, fuel regulator, plugs, wires, ECT sensor and I have tested all the other sensor's continuity and voltages (except the O2 sensors) and they were within limits. If I rev the engine quickly, I can hear a vacuum/sucking sound that seems to be right near the MAP sensor (using a vinyl hose at my ear). The rubber collar around the MAP sensor is intact, so I don't know what the problem could be.
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Wednesday, September 9th, 2009 AT 2:48 PM

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Tiny
QUAGMIRE86
  • MEMBER
***Update****

Problem solved. It was the MAF (Mass Air Flow sensor). Yeah. :)
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Friday, September 18th, 2009 AT 8:29 PM

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