Set timing at 14-16* initial at idle on a warm motor.
When I do timing I set everything at TDC, then I stab the distributor as close the the #1 post as possible. Use timing light to set it at 14-16*.
No vacuum leaks? All the vacuum ports plugged? Mine was doing the same once and I forgot a port.
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5.3L LSx, Fbody .500 cam, TH400, 4500 Stall, Moser 9"
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