1996 gmc jimmy 4.3 vortec misfire
October 17th, 2018, 10:08 AM
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1996 gmc jimmy 4.3 vortec misfire
New plugs wires and cap and rotor cat is gutted out to. It has a misfire between 2-3k rpm under a load. If I down shift to second and drive at 3000-3500 rpm the sputtering gets worse and gets to where it’s pops out the exhaust. Codes I’m getting are p0420 and p1441
October 17th, 2018, 2:49 PM
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1441 came on yesterday its been acting up for quite awhile it’s been parked for about a month been driving it all week I’m waiting for it to give me a misfire code or something I can get some info off of
October 17th, 2018, 3:43 PM
#6
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Have you cleaned the MAF?and how old is fuel filter, trying to think of,what's making a lean condition,you could also unplug cts,make it go rich,see if drivability improves
October 17th, 2018, 7:45 PM
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October 18th, 2018, 11:44 AM
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October 18th, 2018, 11:57 AM
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What grade plug wires did you install?sounds like you have stray spark,I would use a spray bottle with water in it,slowly spray plug wires when it's behaving,try to get it to misfire,or take a peak under hood with limited light,look for arcing at plug wires