Anything put off will surely come back to haunt you.
I've been putting off tuning up my 69 VW for a good month, today, you could hear the occasional mis-fire, back-fire and late detonation of a vw needing a valve adjustment and tune-up!
ALWAYS adjust the valves in your Volkswagen yourself, it's a personal thing. Get back there, and get your hands in that engine.
Overall the valves were not that far out of adjustment, the points (for those that remember them !), were pitting and the nub of the points that rides on the cam inside the distributor had started to deterioate and was leaving some matter on the cam and cam lobe itself. Most likely this was the cause, I always carry a spare set of points (along with fuel filter and various other parts), and should have stopped and checked them right when I heard the misfire.
I also threw in a set of new plugs, rotor and cap, wires looked ok so I left them in. The misfire had caused some arcin inside the cap and on the rotor, physically causing some deterioation of where the rotor contacts the metal stub inside the cap leading to the plug wires.
She runs great now, fweeemmmm....
This has not been my week for vehicles, i've had issues with all three of them !
We'll see if the guy at FLAPS knows what points are this time...