i own a 94' z-28....it starts up easy and runs realy good in the morning but after it gets to operating temp it starts to miss realy bad when under acceleration and once up to speed it keeps missing. I can shut it off and let it cool back down and it will start fine but it will still run like crap. After its been running for a while it wont even idle right, the idle starts to jump around from 1000-2000 rpm. I got this car about 3 months ago and as far as I know the only after market part on it is a muffler. I've had the plugs/wires checked...had a catalytic converter replaced about a month ago. Anyone got any ideas?

 

Welcome to the Board!

I was experiancing similar problems right before my car wouldnt start altogether. More than likely it is your opti spark, read this thread and do as it says to be sure.

https://www.camaroz28.com/forums/sho...d.php?t=601565

Jeremy