Hey everyone again its been a while

. Ive got my '88 924s here almost running, but it still refuses to start even with injector pulse and spark.
It's got new gas in it with stabilizer, and everything seems to be functioning- tested DME, running fuel pump, new DME relay, new filter, new fuel pressure regulator, new spark plugs, new plug wires, new speed/ reference sensors, BUT my fuel pressure builds a little slowly, reaches 2.5 bar, and then when i shut it off drops off too quickly.
The fuel pump is a used unit that I installed recently, and it could be that theres a problem with it. Regardless, ive got pressure. I have yet to test the actual voltage to the injectors, and I also wonder if theyre gummed up. Anyhoo Id appreciate anyones ideas. Thanks,
-Gabe