We had one on the S10 and it sucked, didn't change anything, even milage or starting. In fact its still sitting in my garage, NOT WORKING. We threw an MSD on there and no problems. Even starts a bit better and gets about 1.5 miles to the gallon better milage.
IMO I would never install a Jacobs again, MSD is the way to go.
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I'm on a boat.....
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