MOTOR MISSES AND HAS NO POWER

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WAS RUNING FINE GOT UP ONE DAY STARTED IT AN MOTOR WAS SHACKING SO BAD THOUGHT IT WAS GOING TO FALL OUT AND HAD NO POWER CODES READ 26 22 43 56 SO REPLACED COMPUTER,TPI,MODUALE,PLUGS,WIRE,COILS,THEN IT RAN OK FOR 20 MILES STARTED DOING SAME THING EXCEPT NOW AC WONT WORK EITHER BLOWS BUT JUST HOT AIR THIS IS A ONE OWNER VAN WITH ON 90 THOUSAND MILES ON IT TAKE VERY GOOD CARE OF ANY AND ALL HELP WILL BE GREATLY APPRICATED