1990 CHEVROLET C1500 350 MISSES AFTER ENGINE IS WARM,
JUST REPLACED PLUGS,CAP&THROTTLE SENSOR
My first thought for a solution of your problem is plug wires. You have replaced some common problem areas for this situation but the plug wires are the most susceptible for causing a miss after engine is warmed up. Try replacing the spark plug wires and let me know what happens.
Lefty64
Check coolant temp sensor for reading corectly and connector corrosion, two pin connector by thermostat, if ok check compression on all 8 cyls
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