Ok I bought an msd dis 4 from a guy in another forum. It came with a already prewired harness with the interfaces on it. So I get started with it today cuz it was hell trying to find screws long enough for them. I put them on with the bypass plug that came with it and crank it. My service engine comes one I scan it and get ramdom misfires. I take the intrefaces off and it cranks fine. What could be the problem??? I guessing its coming from the interfaces themself or the harness. I did a check on them to see if current goes threw them with a meter and it looks good. Anyone know anything I can try??
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