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need do a tune up change spark plugs and wires.clean fuel injectors and change fuel filter.if engine equiped with distributor replace distributor cap and rotor.if vechicle still misses.could have bad ignition coil or cylinders have low compression.
Sounds like ignition control module (small plastic piece in bottom of distributor). When it gets warm it's shorting out. Easy fix, disconnect battery, pull cap & rotor - gin module is 2 screws in bottom of distributor and 4 wires - replace wires in exact order and coat bottom of middle with dielectric grease, replace rotor, cap & connect battery NEGATIVE CABLE LAST!
You will have dry all ignition components ... You have a distributor that you can open? Get a drying agent from your auto parts store (spray can) and spray all high voltage wires. Next sunny day, roll the Vette into the sun and leave the hood open all day.
The ignition module inside the distributor may be the problem. Get a new one and try it out. The modules from GM are more dependable than aftermarket ones. If that is not the problem, it's nice to have a spare module in case of an emergency failure. Squido