so confused posted by Thenumber1zman on May 01, 2010 at 01:59 PM
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First check voltage at coil pack harness in question and the injector harness. If that is good, then switch the coil pack with another one from a known working cylinder that shows the rpm drop. That way you will rule out a bad coil pack, if no change, check your injector,ohm it out, it should read between 10 - 14 ohms. If it does not ohm correctly replace injector, but before make sure your grounds are clean and properly bolted.