[c4zr1]

Update on the miss

I put in a set of NGK Iridium IX plugs. Put in some Lucas Injector cleaner ran about 3/4 tank of gas through the engine.
I did decide to take it to the local chevy dealer to let them run an engine analysis on the engine. Had an appointment at 8:30 yesterday morning. I never did hear anything from them so I went back at 5p.m. and ask the service adviser if I could have an update on my car. He told me that they have not been able to look at it. That did not set too good with me I certainly did not want to leave it overnight so I told him I would just take the car. When I got back home and in my driveway the engine service light went out. It seem to be hitting on all 8 cylinders. I decided to take it out for a spin. It did pretty good, the secondaries started to kick in. When pulling up to a stop the engine service light did come on a couple of times, but after I set there a couple of minutes letting it idle a little faster the light would go back out. I made it back home then without the service engine light coming back on.
3 hours later
I started the Z no engine service light. Great!
I put the Marc Haibeck chip back in. The engine was already running bad when I purchased the chip from Marc. I took that chip out and put the stock chip back in while trying to dianose the engine miss. I was hoping that might cure my problem.
I took the Z for a test drive.
It drives like a ZR-1 should now. The chip makes it even run better.
I think I had dirty injectors and eventually the Lucas Injector Cleaner cleared up the injector or injectors that was not working.
I feeeeel a whole lot better now.

Thanks to those that responded!
Don