I HAVE A 1976 K20 WITH A 350 TBI FROM A 94 CHEVY VAN . THE TRUCK HAS TROUBLE STARTING , BUT WILL START EVENTUALLY . SHE IDLES JUST FINE , BUT AS SOON AS I PUT HER IN DRIVE & GIVE HER SOME GAS THE ENGINE JUST DIES . . . I CHECKED FOR VACUUM LEAKS , COULD NOT FIND ANY . I THINK ITS EITHER THE FUEL...