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Runs rough,multi misfiring, 98 gmc 5.7
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Question
MichaelEd72
98 gmc 1500Z71 5.7 vortex
Started out with misfire #7 when heavy on the throttle. Did a time up plugs (ac delco)and wires. Still when heavy on the throttle usually at 80+mph check engine light comes on motor runs like it's misfiring. Code now has become multi misfire.
So now I do cap, rotor,wires,change to platinum plugs gap .06, fuel pump,filter, battery, coil ignition mod. Truck low end performance improves, but still runs bad( like its misfiring) at around 80 and requires all of acceleration to keep it there.
After frustration over a couple of months I ran it very hard as it started acting up and now runs so bad it can barley idle.
Codes now are multi misfire, MAF,MAP sensors, throttle position sensor.!!!
Those have been check and replaced and also spider injector replaced, with still motor running like its on half the cylinders!!!
Any ideas?? 207,000 miles
Taped out mentally and financially..
Sent from my rotary phone.
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