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94 jimmy 4x4 4.3 vortec running rough/backfire

02-03-2010, 07:48 PM
I have a 94 jimmy 4.3. it is running rough and occassionally backfire/popping from what sounds lie under the hood. Ivecahnged plugs, wires, egr, oil and filters. tommorrow im changing cap and rotor. Any more ideas??

02-03-2010, 08:11 PM
Have your catalytic converters check, a plugged cat will cause the same symptoms.
It's a cheap test, that canbe done @ any local muffler shop.

02-03-2010, 08:36 PM
I thiink ill just take the cat off since i live in a no e check county. Ill just weld a straight pipe on.

02-03-2010, 11:25 PM
Try doing a fuel pressure test and post back with the results

02-04-2010, 04:17 PM
I changed rotor, cap, feul press. reg. and plenum gasket and truck is running great.

02-05-2010, 10:45 PM
what was it doing? I know it says runing rough, was the inside of your plenium filled with gas? What was the symptoms you had?

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