Brett,

I question whether the In-Tank pump is/could affect your cold-running symptoms. And there is no "automatic Key ON Prime" with LH 2.2 (even though some may do it randomly).

Is the tank pump working? You can test removing Fuse #4 and jumpering +12V from Fuse #6 (always hot, so you can do it with Key OFF and listen for the pump. (Jumper between the "hot" – Left Side – fuse holder contacts.) You can ignore fuse #6. It's a dummy on LH 2.2.

I'd also look for vacuum leaks as I mentioned in the other thread. I'll repeat the Propane method here to save you hunting back—

—I use Propane to test for vacuum leaks (less messy than carb cleaner or other sprays). Take the nozzle tip off a simple propane torch and replace it with a piece of snug fitting rubber hose about 2 feet long. Practice with the valve to get a moderate flow of gas (not a roaring blast).

—With the engine running, open the gas valve and play the end of the hose close around each injector for a couple of seconds. If the seal is leaking, you'll hear the engine smooth out or rev up when the propane gets sucked in and burned. Same thing for any other suspicious areas.

—To block the breeze from the fan, lay a piece of cardboard from the fan shroud to the engine.

Hope this helps,

--
Bruce Young,
'93 940-NA (current), '80 GLE V8 (Sold), '86 240dl, '85 244 ti, '83 245t
'76 244 (R.I.P at 255k), 73 142 (98K), '71 144 (ex circle track car)
Used '70 144 from '78 to '92, New 144 from '67 to '78, Used '62 122 from '63 to '67