MY 87 4.3 RUNS, DRIVES, AND IDLES GOOD, HOWEVER AFTER DRIVING IT FOR A WHILE, LIKE AN HOUR OR MORE, IT WILL LOSE POWER LIKE IT IS GETTING CHOKED FOR FUEL. WHETHER I AM DRIVING OR STANDING STILL. WHEN IT IS DOING THIS I CAN PRESS THE GAS PEDAL AND IT ACTS LIKE IT IS GOING TO STALL. IF I TURN THE KEY OFF AND START IT RIGHT BACK UP, ITS FINE AND RUNS NORMAL UNTIL THE NEXT TIME IT DOES THIS. I HAVE CHANGED THE INLINE FUEL FILTER, BUT NO CHANGE. I NEED SOME INFO. HERE BEFORE I GO REPLACING MORE PARTS THAT I DONT NEED. I HAVE ALSO USED FUEL CLEANER ADDITIVES WITH NO LUCK. THANKS IN ADVANCE FOR SOME INSIGHT WITH THIS