Cylinder 4 misfire

Asked by May 17, 2018 at 06:23 PM about the 1997 GMC Sierra 1500 C1500 SLE Extended Cab SB

Question type: Maintenance & Repair

Cylinder 4 misfire. Hooked up to machine. Misfire
goes to zero when step on gas. Put 2 bottles fuel
injector cleaner in. No help. Replaced fuel injection
spider.  No help. Replaced cap and rotor. No help.
Replaced all plugs with ac delco and replaced
wires. No help. Actually runs worse now with all
these new parts. At idle i can hear and feel rough
idle. Before it was just rhe check engine light

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