I really dont understand either! When I had my timing up to 12 The idle was REAL choppy and rough, and it surged badly below 2000rpms. I dropped the timing down to 9 and it almost completely stopped surging and the idle became much smoother, like stock. It also detonated when I went to the track at 9 degrees timing. When I bumped the fuel pressure 10 lbs it seems to have stopped the detonation. I think its leaning out. Or my MAF is completely fucked.
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95GT B303 cam, 1.7 rockers, 65mm TB, 73mm MAF, milled heads, 355's K&N, BBK Longtubes, Flowmaster cat back, pulleys, msd coil, 9mm wires, Tremec 3550, Pro5.0 shifter,10.5 Motorsport clutch, FMS aluminum driveshaft, weld in subframe connectors
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