engine misfire on 350 vortec

Doug Domm · 11-01-2011, 06:30 PM

I have a 98 z71 1500 350 vortec that shows a misfire on #4 cylinder with a Snap-on scanner. This misfire occasionally goes away but is there most all the time. It will show as #4 cyl. and once in a blue moon will swap as #3 cyl. Shows only at idle and will go away if you turn on the air conditioning or if you just break the throttle of idle. It runs fine on the road and has as much power as it ever had before. Sometimes at idle it will get so rough it'll almost shake your fillings out. Replaced plugs, wires, cap, rotor and has good compression. Help!!!! Thanks Doug

11-01-2011, 06:30 PM	#1
Doug Domm Member Join Date: Apr 2006 Location: canada Posts: 251 Likes: 29 Liked 84 Times in 21 Posts	engine misfire on 350 vortec I have a 98 z71 1500 350 vortec that shows a misfire on #4 cylinder with a Snap-on scanner. This misfire occasionally goes away but is there most all the time. It will show as #4 cyl. and once in a blue moon will swap as #3 cyl. Shows only at idle and will go away if you turn on the air conditioning or if you just break the throttle of idle. It runs fine on the road and has as much power as it ever had before. Sometimes at idle it will get so rough it'll almost shake your fillings out. Replaced plugs, wires, cap, rotor and has good compression. Help!!!! Thanks Doug

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