Question about 1999 Chevrolet Silverado 1500

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On my 1999 chevy siverado 5.3 vortex engine on acceleration backfires at about 3000 rpm. Engine ides rough when heater controls or air condition is on.

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If it backfires you could bend a rod, pull your plugs

Posted on Sep 13, 2013

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Sounds like you have a bad spark plug or wire.It may even be a bad injector .
Symptoms of lack of power under load

Posted on Sep 06, 2010

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Why is my 1999 Chevy Tahoe backfiring?


Hi Dion:
When under acceleration, an engine experiences increased cylinder pressures. If you have a spark plug(s) that is in poor condition, it can misfire (or not fire) then, so the unburned fuel will ignite in the exhaust, and "backfire".

Another possible cause could be that the timing is not retarding when the vacuum drops under acceleration.

My recommendation?
TIME FOR A TUNE UP
Cheerfuls.

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http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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Nissan Pathfinder Backfires? http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-backfires.html
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----------This will help.Thanks.

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Vacuum leaks. Check all hoses and intake bolts. Leaking EGR or plugged PCV valve. Air filter plugged. Leaking head gasket. Worn timing chain. Camshaft lobes worn. Valves burned or leaking. Fuel idle control system or sensor. Good luck!

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