Dang, Brian... you gotta problem with Hit-And-Miss?? ;-}
(sorry, couldn't help it...)
Okay, basic rule of gaseous propane fuel'd spark-ignition engines- when they SOUND AND ACT RICH (i.e. ... if it was a gasoline engine), the propane engine is usually running LEAN. When it SOUNDS AND ACTS LEAN, the propane mix is usually RICH.
Brian's got an excellent point, Very first thing I'd look for is a vacuum leak... just in case something happened and a manifold developed a crack or something.
But the OTHER thing... I just put a Pertronix kit on my D17... and it ran fine for about three months... then started dying-out on my at random incidences... sometimes it'd restart, sometimes not.
Turns out that the coil bracket wasn't making good-enough contact into the COIL... it'd go intermittant, and engine would stall. Found it by grabbing a socket out of the toolbox, and crankin' engine, tapping the bracket with socket, and it popped on... sputtered and fussed, so I tapped it a bit more, and it recovered, been running fine ever since.
Now, if you haven't changed or disturbed the coil, I wouldn't spend much time workin' on that, but the condenser and bracket- definitely. Bad contact at the condenser will make it REALLY mad. You may have contamination on the brand-new ignition points. May also have a fair amount of wear on the point cam lobe (poor lift) or worn distributor bushing. Bouncing points due to dry point cam will cause points to 'bounce' a bit, that could cause funky problems.
Fortunately, it sounds like you can MAKE it run bad... if so, that means you can do some sleuthing while it sputters and sneezes, in hopes of finding the one thing that has a very immediate effect. Sleuth away!
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