Listen my 96 Z28, has developed a mis-fire. Now I changed the plugs, and wires withing the last.... 20,000 miles (thats how long I've owned it)... while ideling today after court, the car made a couple backfires, and shook, then the low oil light came on... (I shut the car off) and the light went out... I know those sensors go bad... so Im not really worried about the oil. and my oil pressure was arount 10-20lbs idle (normal for an LT1)... I stopped at Knopps, and hooked the scanner up to it, and it has a serious history of mis-fires... but nothing current, (even with the car shaking and acting up) The plugs are such a pain in these cars... so I wanted to see if anyone else had the same kind of issues.... Also got a code for an O2 sensor (post cat).. so that should not effect how the car is running.... didnt know if I should still go old school and pull all the plugs and wires, or if I should put a new OPTI-SPARK in it, since I think its the original one with 140,000 miles on it. A little advise would be helpful.. since I bought my girl a 95 Z28, and I can t have hers being faster than mine...

 

It's possible the cat is clogged

 

High flow cats... with less than 20,000 miles on them... you think thats possible????

 

Well checked fuel pressure... GOOD.... said screw it and ordered a GM opti from a person selling one new in the box.... $215 shipped.... couldnt beat the price.... Ill check the wires and plugs during the swap.... Im pretty sure the swap will be a pain in the ars.

 

optis are a pita. you have closly inspected all of the wires for over heating?

 

all of the opti's wires... or plug wires??? I have yet to see one up close, and off of the car.....