[SPARKS390]

My 1996 Astro with 140,000 mile stalled a week ago and will not start. It showed no signs of a problem, it just quit. I was able to read the an error code from the ECM and it say P300, random missfire. I checked for spark by pulling a plug and seeing I had a spark when you turn the engine over. Then I connected a fuel pressure guage and noted I had 50 psi but it drops off alsmost as soon as I would stop turning the engine over. Chevy suggested I had a bad fuel pressure regulator so I changed it, but it still will not start. I connect a scope to the mass air flow sensor and can see it is sending a signal. I have run out of ideas as to the cause. I would welcome some new ideas on the problem.

Thanks.