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Miss fires at idle


Toadturbo

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Hi all, I have an 96 STS that has miss fires in cylinders 6 and 8 at idle. The miss is just there at idle and goes away with increased rpm's. Checked code and got pc 0300. The plugs and wires are new delco. The fuel pressure is fine checked with gauge. The injectors and coils have been changed with cylinders that do not miss and the problem does not move, it stays. The compression was checked and the cylinders are around 120. I did notice that my volts at idle drops to the mid 12's and then as the rpm's increase the volts jump back to the mid to high 13's.

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I would check to see if #6 & #8 plug wires are not arcing on a piece of metal somewhere. If that does not work I would check the injectors.

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