stroccoli

I had a similar problem on my 78' (no balast resistor in the engine compartment) It would bog on rapid acceleration, but very slow increase in throttle would not cause it When it failed the tachometer would die (zero), and ignition stop. Also during regular driving conditions it would balk randomly between 2-3000 RMPs After chasing through the entire ignition system, trying an AFM (another site recommended) and the tps (I thought maybe the 2-3k throttle position might be doing something), and coil I thought hmm... distributor vacuum ? I dis-connected the vacuum advance and it's corrected (doesn't bog). Ordered a new distributor. Apparently in mine the vacuum advance is shorting out the ignition circuit in the distributor. 40 year old parts behave strangely