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i had the same problem multiple times with my car, and the fuel pump crapped out each time...the first time it started and wouldnt rev past idle, then stalled and wouldnt restart until a ride on a tow truck. then it wouldnt recreate the problem unless it was put under load...the 2nd time my pump went it wouldnt rev past 4500 under WOT. The third time my pump went it would run but backfire like crazy and was ridiculously low on power.
I would check fuel pressure again, and if you can get it started tape a gauge to the windshield and take it for a ride around the block or parking lot...see if it falls. You may also want to check for volume of fuel, and voltage to the pump. you can start with easy stuff, like fuel filter (it probably needs to be replaced anyway), if that doesnt help...move on to the bigger.
Like said above dont count out ignition either...
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87 iroc with the usual go fast stuff
heavier than your half ton.
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