ok about 3 weeks ago, my car started missing. at first it wasnt too bad and then it got worse. i replaced the wires and the plugs on it but its still happening. but when the car sits overnight or hasn't been running for a while, and its cold, it doesnt start to miss for about 20 miles or so. and this problem doesn't happen too much unless i am at higher rmps. does this sound like the opti? by the way it is a 94 z28.

 

higher RPM miss is usually the opti.

 

How many miles on it?
The cap and rotor could be bad.
My optical part was fine but the cap and rotor were toast when I pulled them at 135k.

 

it has 85,000 on it. i already have the opti, cap and rotor i just want to make sure that was it before i put it on. how hard is it to install and opti?

 

Here's a good install guide.

 

Its not bad at all.
I had a friend help me out cause I had to replace the oil seal on the water pump drive shaft, it took us about 4 hours.
2 to take it apart which I did, and 2 to put it back together which my friend did most of.
Fired right up and the car runs so much better now.