1996 Chevy Tahoe misfires

1996 CHEVROLET TAHOE
167,000 MILES • V8 • 4WD • AUTOMATIC
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ALESTER
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ok here it goes. on my 1996 chevy tahoe it get a misfire code on the #7 cylinder. i changed the plugs wires cap and rotor to no fix. the car runs good when ur driving. but at a stop with your foot on the brake it is fine for a little bit then the RPMs start to go up and down and the car wants to move. and now after replacing all that it starts hard. when i turn the key the 1st time it wont start. it takes about 2 or 3 times before it will strart but after its started and i go to the store it will fire rite up. not really sure what the problem is but im on a tight spending budget from being layed-off. please help
Aug 25, 2010 at 2:05 AM
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WRENCHTECH
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Is the plug from that cylinder getting real dark or staying real white?
Is it setting any other codes and what are they?
Aug 25, 2010 at 2:58 AM
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ALESTER
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nope no other codes plug is getn a little white. the temp of the manafold is the same as the others using a fluke temp lazer heat gun. just really not sure what the problem is
Aug 25, 2010 at 3:28 AM
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ALESTER
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the only code i got was #7 cylinder misfire. not really sure what the next step is i did all the regular stuff. what would the next step be with it stayn white or if it was black i just changed the plugs a few days ago
Aug 25, 2010 at 3:42 AM
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WRENCHTECH
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[quote:3bfbf862a8]stayn white or if it was black i just changed the plugs a few days ago
[/quote:3bfbf862a8]

What does that mean? I'm trying to find out if the plugs are fouling or not.
Aug 25, 2010 at 4:36 AM
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ALESTER
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oh sorry they look like new with black charing on them sorry. i was just asking if they were black what would that mean and if they were white what would that mean? im really not a car guy just the basics
Aug 25, 2010 at 4:44 AM
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WRENCHTECH
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[quote:9a2a7812b3]oh sorry they look like new with black charing on them sorry[/quote:9a2a7812b3]

It can't be both ways. I'm afraid this may be beyond your abilities. Your going to need some hands on help.
Aug 25, 2010 at 5:23 AM
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ALESTER
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i just went out and pulled the #7 spark plug and yes it did have like a white powder on it. cleaned it up put it back and it didnt change anything
Aug 25, 2010 at 6:17 AM
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