hello new member here i have a 94 Z-28 lt-1 auto runs real rough when you start it misses real bad new coil plugs wires fuel pressue is perfect exhaust pipes are real black car runs rough like i said but if you stomp on it it goes strong but misses and back fires a little ive been tracking this problem for a while please help pleaaaaaassee!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

Optispark

 

i was thinking that to thx

 

Seriously i wouldnt got replacing opti-spark right away. I SEE WAY TO MANY people blaming everything on the opti. I have a problem similiar to your's, i'm going to explain my problem to you so you can see if your's seems simliar. When i start up my car no matter if it is warm or cold at idle my car will sit there and shake and i can notice the rpm's dropping a tad. When i'm driving and trying to maintain a speed it'll start stumbling really bad and the car will start shaking. This is defintly noticable when you try to go up a hill, and even more so when you go up a hill in 5th or 6th. When i go wot it seems to clear up more-so than just cruising but the car just doesnt pull like it use to. Well a few days ago i tried some fuel injector cleaner, and a day or two after that my car got noticably better, i mean a whole lot it was actaully not annoying to drive anymore. The problem still isnt completly gone but i'm going to run some seafoam through my car. And if i let my car sit for a day or so without running the next time i start it, it'll be missing really bad but with that injector cleaner it seems to clear up after about 10 minutes. I would try some fuel injector cleaner first since it's cheap, and also a fuel filter. Also at night you can start your car and look under the hood and see if you see any wires arcing.

 

i tried fuel injector cleaner did not help the new wires seem to make it a bit better but still runs real bad

 

thanks for the help it was the optispark it had a big hole burnt thru the back and the rotor was loose put some seafoam in it its running real strong thanks again

 

HOw hard was it to pull the opti

 

Gotta pull the fans, coil, air pump, water pump, and crankshaft balancer pully. Fun stuff.