I work at a ford dealership and drive some 3.8 Mustangs here and there. We come across some in the cold that initialy start rocky. They smooth out in a little bit, but with that motor, it seems pretty common. It also depends on how long it goes on. Does it last a long time, or just a couple seconds?
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89 black GT, 5 spd
air silencer removed
flowmaster cat-back
FMS 9mm wires
looking to modify more!!!
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