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1999 Z71 Hesitation/misfire

weez

By weez
in Ask A GM Technician

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weez Enthusiast

weez

Posted
Posted

Hi, I have a 1999 Z71 4X4 Extended cab. When I'm driving (cruising with no load) between speeds of 70-85 km/hr the truck chugs/misses/hesitates. If i let off the gas or accelerate it goes away. It has been doing it for a few months now and I was going to change the plugs/wires/cap/fuel filter and so on but I thought I'd check if anyone else has ideas what could be causing this. I'm confused since it only seems to happen when the engine has been operating for at least 1/2 an hour or more. The engine light is not on. Thanks.

  • 2 months later...
svensk Senior Enthusiast

svensk

Posted
Posted

I have the same problem. Transmission tech went on a ride along and said it was a miss while in lockup. He didn't think plugged cat because he thought I wouldn't be able accelerate above 3K rpms and it would be a turd off the line. Possibly intake gasket leak?

weez Enthusiast

weez

Posted
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Posted

Well I haven't gotten many suggestions on this issue but I do have further details on when the hesitation happens. In addition to my above description, my truck experiences a rough hesitation and slight backfire or misfire condition while under extreme acceleration (when the accelerator is pushed all the way down). Hopefully somebody out there can offer some advice. Thanks.

  • 3 weeks later...

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