Hello, all. My 85 300D has started some odd behavior. It’ll be running along just fine and then, suddenly, can’t get out of its own way. I have to practically bury the pedal just to keep it running and it won’t rev up at all. Then, just as suddenly, it clears up and I drive on.

I have to pull over when this starts and it takes 30-90 seconds to straighten out.

Bad gas?
Clogged filters?
Sunspots?

Thanks!
Bobby