I've got an 86 that's carbureted that had the same miss. I changed the wires(they were original)the cap, rotor, rebuilt the distributor (the advance didn't work), advanced the timing and went from 32 to 35.5 MPG. Can't beat 'em. I just drive the snot out of it back and forth to work.
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Orlando,FL
72 Chevy 4x4 3/4T CustomCamper w/SB 406
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68 Chevy CST SWB w/LS1, carb & 700r4. Golden Anniversary clone with a few improvements.
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