What's your timing set at? If it got worse when you put 87 in it, could be timing. Also could just be bad ignition parts. Could be coil, could be TFI module, could be the pickup coil in the distributor.
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Michael Black
QuantumMotorsports
Norman, OK
1984 LX Hatch
306 w/ TRW forged flat toppers, Comp Cams Magnum 292H, GT40P heads w/ 3 angle valve job, .550 lift springs, Angus Racing Roller Rockers, Weiand Stealth Intake, Holley 4150 650cfm carb, MAC 1 5/8 Long Tubes, Single Chamber Flowmasters, 91' T5 w/ Pro 5.0 shifter, Turbo Coupe 8.8 Rear w/ 3.55 gears, QA1 Motorsports tubular K member, no interior except steering wheel and seat.
Coming soon: 6 or 8 point cage, Fuel Cell, Weld Draglites
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