I had a power problem with my 91 245 M47. Also knocking-pinging and hard starting. I mentioned it to you.

I drove ~ 350 miles today, mostly highway speed. It's fine - perhaps a teeny bit sluggish compared to my 92 AT. I could almost feel it run stronger & stronger as I drove it on the interstate today.

Here's what I did: new fuel filter; new main & lift pumps; new plugs, cap, rotor, wires; cleaned throttle body; removed airbox flap; flushed the engine w/ kerosene through intake port (which I've been doing to older cars since the 1960s). I also removed the snorkel and then put it back on - I don't think it made a difference.

This car had been sitting for ~4 years. I think I had 3 problems: 1) Old gas; 2) varnish deposits in the engine; 3) bad in-tank pump. The rest of the part-changes above were superfluous.

You bought yours at an auction. Perhaps it sat for a while. Perhaps driving it will help.