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I would get rid of the underdrive pulley. Even though its not likely your problem, you literally are going to be in the 800 to 1000 range i don't see a need for it. I also thought that our cars regulate voltage to around 12.5 after the car has ran awhile. No matter what accessories are on it keeps it in that range. Sounds like something else is up or you need a new tuner.
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