I don't suspect the in-tank pump exactly from those symptoms though it could also be bad.

There could well be a hole in the short fuel hoses in the in-tank sending unit. This would cut some flow to the main pump. With a bad in-tank you'll noticeably hear the main pump complain. I say it goes MMMWWAARRRWWWWRRMMMMMMWWAARRRR. :)

I'd go after ignition components first. This literally happened to me this week with my wife's 90 745T. The spark plugs were shot. The wires were iffy and had a couple of abraded spots. And the dist cap and rotor showed a bit of oil intrusion and the rotor had burning on the tip.

The end result was that the car would barely start and move into the driveway on a wet day. New plugs got it running almost normally again, and a new cap and rotor helped the rest of the way.

Good luck,
--Rob
--
89 244GL Turbo // 92 244 M47 \\ 90 745T // 76 242 Convertible