Quote:
Originally Posted by lcarney1977
my car is tuned on hp tuner.. the tuner siad at first it was a air/fuel thing not getting enough fuel up top when in boost but im only making 565rwhp with my D1. he said he tuned it to help that issue with fuel but its still doing the same thing surge hard when on the highway hit 3rd or 4th wot... i mite have to check all my plugs now ..
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Sounds like the car is pulling timing. Pulley up or upgrade your fuel set up.