1997 GMC Safari Question: Van starts idles ok but misfires when revved

Only came up with random misfire P0300

When key is turned off, does fuel pressure drop off more that 10 psi?... If yes,possible fuel spider problem!.... Also distributor 'assembly' is suspect for random P0300!

No the fuel pressure stays as is until release button is pressed so it would seem the fuel pressure is great. Will remove distributor tomorrow and give it a once over then possibly move on to ICM when I can figure out where it is

did u get it fixed and if so what was it??

Turned out to be a plugged cat convertor