Chevy/GMC Small Trucks Forum Discuss the Colorado, Canyon, Sonoma, S-10, etc here!

rough running

Old 01-09-2008, 07:45 PM
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Join Date: Aug 2007
Posts: 2
Default rough running

I have a 1999 sonoma with a 4.3L v6 (ends in X) that is 2wd with a regular cab and about 93k.

Recently, at highway speeds, the truck will jerk (not violently) almost as though the fuel is cutting out. As long as the accelerator is depressed, it doesn't seem to be as much of a problem but as soon as I let off the gas, it will begin to jerk - it's as though I am pushing down and letting off the gas pedal repeatedly.

Any thoughts would be appreciated.
Old 01-10-2008, 05:51 AM
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Join Date: Feb 2007
Posts: 2,167
Default RE: rough running

maybe a dist cap...any codes?
Old 01-10-2008, 03:40 PM
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Join Date: Aug 2007
Posts: 2
Default RE: rough running

no codes

changed distributor cap and rotor

have new plugs/wireset but haven't changed yet
Old 02-04-2008, 08:17 PM
Join Date: Feb 2008
Posts: 2
Default RE: rough running

i had a problem kinda like that and my temp sensor was messed may also want to check the fuel to air ratio sensor
Old 02-16-2008, 02:29 PM
Join Date: Feb 2008
Posts: 1
Default RE: rough running

I had the same problem about 2months ago, its definetly something to do with your distributor. Could be the button or something else to do with it. unfortunetly GMC didn;t make there distributors like Chevies and there known to cause problems like yours. Its a quick 80$ repair at any backyard mechanic. Or 30$ if you do it yourself.
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