It would see from what you have found that the ICM is functioning, Being that you get that momentary start, that tells me that the injectors are being rattled for the start.. So you get that brief couple of seconds and then its dead..
What you describe does sound like a bad PCM, But its really hard to say without being there to look at it.. I'd say the crank sensor can be a possibility, but usually the symptoms will be intermintent at first and worsen over time or cause an intemintent stall when warm or a no start condition( No spark or FI pulse )...
I'm leaning towards the PCM, But I can not say that for certain..
If you are looking for a cheap PCM, You will want to look at the 94-95 Olds, Chevy and Pontiac Minivans with the 3800 Tuned Port Injection V6... The 94-95 Buick LeSabre, 94-95 Pontiac Bonnevilles, 94-95 Olds 88-98.. These all have the same PCM... Try to get one from a 95 if possible
If it helps any I have been trough 2 PCM'* in 146000ish miles... The factory bit the bullet... And the Reman gave me a bit more than a year and started to stall at random, and upon starting the car( cold ) it would run for 3 or 4 minutes and then just die... Sometime it wouldn't start again..
Also I have been wonderin if you computer has any codes in it... Mainly a P1361 Mainly this means that the PCM is not taking over control...
Whats supposed to happen if the PCM does not take over is that the engine is supposed to run in Module mode, Mine did this to some degree( not very well ) and at that piont the SES light would be on... My problem was the PCM... Simmilar problem happen both times..
Like I said, and I say it a lot... If you lived near me we'd have a few parts to throw at it... Hope we see you get the problem resolved
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