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Discussion Starter #1
I'm running an 87 Octane tune from BOC for a mostly-stock 96 4.6L... The odd thing is that I'm running the remainder of my tank of 91 octane and the car is bogging a LOT under load and vibrating as if it were misfiring (like how it felt when a plug wire had come loose from the coilpack) but the wires all appear to be snugly on the coilpacks.

It ran fine on the 91 octane tune.

Any ideas?
 
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