I have a 1998 Chevy Blazer 4.3L w motor check engine lite is on code po 300 random miss fire # 6 5 3 cylinder seems to mis fire. cap rotor wires plugs ok new fuel injectors and fuel pres regulator installed still have same problem. Seems to be running rich wont idle and poor pick up any suggestions would be appreciated .
Thanks Mike
Hey Mike,
I would definitely start with the basics, distributor cap and rotor, and spark plug wires. You said they are ok .but I ve installed NEW parts that were faulty. Is there anything rubbing on the inside the distributor cap, is the rotor installed firmly on the shaft, are there any sparking marks on the rotor or inside the cap?
Some other items I would check :
Is there a vacuum leak under the hood? Have you manually checked the fuel pump pressure? Any codes stored? EGR valve working properly?
Blessings,
Austin Davis
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