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tempermental when it comes to these type of things. Before you spend all your money on possible causes, you need to narrow it down. And if it ran fine one day and then all of a sudden your down 3 cylinders then it most likely isn't coil packs and injectors. Here is what you need to do first:
CLEAN all your contacts on the injectors, ptu and cas. If you see green shit all over, then that is probably your problem. While doing that you can OHM test your injectors - get yourself an ohm meter, they should be between 10-14. If they all good, then it rules injectors out.
Then clean your PTU connections (located on front of engine passenger side).
Then clean your cas connection (located on front of engine drivers side).
I had the same issues, then after a good cleaning it ran fine. If you want someone to look at it, contact harry at ztuner@ztuner.com. He's awesome and is somewhere in Florida. But you can do some of the pre work yourself, learn a little about the engine in the process and use search often here. It is what I did and fixed most problems myself, not costing me huge $$$. Any questions, just email me and I will try and help you out. I'm no z expert, but think you don't have as serious problem as you think.
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20:19:43 06/16/09
