I have got a random multi misfire on my 1996 LT1 Z28. I have changed spark plugs, wires, optispark dist, cap & rotor. I have changed injectors as well. Installed new EGR valve and cannot find a vacuum leak. I have still got a misfire on #2. The car runs bad under a load levels out when cruising. The analyzer shows that the misfire comes and goes. Anyone with any other ideas would be greatly appreciated.

 

Is #2 misfiring a lot more than the other and why?

Do you have a bigger cam in the engine?

Did you replace the whole optispark, brand new? I'm not sure reading "optispark dist, cap & rotor" Did you hook up the vent and blowing tube to the opti correctly.

Have you check your coil?

good luck

 

The engine is still factory stock. #2 is misfiring the most. You can feel it pick up and drop out. The optispark dist was changed as well as cap and rotor button. Any ideas as to the cause?