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first you got to figure out if it is fuel or electrical. spray a little starting fluid into the intake andtry to fire it up, if it starts for a few seconds it a fuel issue, if it does it may be a electrical problem. Fuel issues range in fuel pump, fuel filter, fuel rpessure regulator and so on, elctrical issus revolve around spark plugs and coils and such
check to see if your plugs need changing and then check your HT/LT leads on the plugs as they may be loose or water clogged somewhere or have a split wire that is just touching enabling it to fire a few times
Try your ignition coil. That year model chevy has a dry running coil and it does not go out all at once. It will spark and run while cool but just as soon as the everything starts to heat up the resistance in the coil begins to build and it quits firing. After letting the vehicle set a little while and cool off it will fire off and run just fine untill it starts to heat up again.
Check your grounds guys...if even ONE ground is loose or corroded from the block, she'll act up...especially more when warm. Another good place to check is under your console (behind radio), this is where your main ground actually connects (weird yes) but we've rebuilt a stealth and had this problem....turned out to be the ground on the metal chassis behind the radio.