Either the carb, or the timing.
Set engine to TDC #1, remove cap, rotor should be pointing directly at #1 cylinder, if not, remove and rotate so it does.
Start with 8 degrees BTDC with mechanical/vacuum advance off. No more than 36 degrees total advance.
As far as carb, take car to chassis dyno and have air/fuel ratio checked on dyno with wideband O2 sensor. Usual cost is under $100 for 2-3 runs.
If problem persists, check compression with mechanical gauge, look for low compression on one or more cylinders, indicating a bad valve, valve out of adjustment, too much pre-load, bad rocker, bent pushrod.
Tuesday, April 21st, 2009 AT 6:01 AM