Any Resolutions On P0300 Random Misfires On 6.0

[PACKORACKDAD]

I THINK I'VE READ OF SEVERAL OF US CHASING RANDOM MISFIRES ON 6.0 GM, HAS ANYONE RESOLVED THEIRS? I HAVE A 03 1 TON AND HAVE FOLLOWED EVERYONE ELSES SEQUENCES OF EVENTS, SPARK PLUGS, WIRES, AIR FILTER, FUEL FILTER, REPLACED CAT CONVS/AND CHECKED FOR INTAKE LEAKS. IT RUNS FINE AT START UP BUT AFTER 30-40 MINUTES OF DRIVING THE SES LIGHT BEGINS TO BLINK AND STARTS TO MISS AND AC QUITS WORKING, PULL OVER TURN IT OFF FOR 5 SECONDS AND YOU ARE GOOD TO GO FOR ANOTHER 10-15 MINUTES (SOMETIMES LONGER). TOOK IT IN A COUPLE TIMES TO MY LOCAL SERVICE CENTER, NO HELP. RANDOM MISFIRES ON RIGHT BANK ONLY SWITHCHED COILS, CLEANED INJECTORS, NO DIFFERENCE THEY FINALLY SAID THEY COULD FIGURE IT OUT SO SORRY. ANYONE FIGURED THEIRS OUT? THANKS, SCOTT

[ATMINF]

Alot of guys that get a "PCM TUNE" (with a different PCM) get a PO300 code, and need to get a crank relearn done. Do you have a different PCM? Or did you have anything done that would mess around with the crank position sensor?