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Discussion Starter #1
I have a '96 Z28 with an LT1. Lately the car has been running rough and has sent a misfire code to the computer numerous times. The last code I got was P0300 Random/Multiple Misfire. The car stumbles and hesitates when in the 1500 to 2000 RPM range. After 2000 it seems fine. I've tried many remedies such as: new plugs and plug wires, injector cleaner, new cap and rotor, new coil wire. I've checked for vacuum leaks and everything seems fine there. I'm at a loss as to what could be causing this. Any help is greatly appreciated.

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Double check the plug wires to make sure they are in the correct firing order.

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68SS ZZ4, 4sp T-10, 12 bolt, getting painted

78Z28, 330hp vortec, TH350, 10 bolt (just finished)
 

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New Cap and New Rotor in a '96 Z?!?!?!

Do you mean you replaced the Optispark?

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Steve McCorry - Central Ohio Camaro Club
'69 Camaro RS/SS-350 - Daytona Yellow
'95 Camaro Z-28 - Sebring Silver
click here to see my car ---> www.mindspring.com/~mccorry
 

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Discussion Starter #4
I didn't replace the entire optispark setup. I replaced the outer cap, the rotor and the plastic cover. I still have the original photo emitter/receptor and metal discs.
 
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