i have a 1968 dodge polara 500 with a 225.suddenly it started hesitating when i would gas it,if i give it slight throttle it is fine but any more it just won't go.it idles fine and revs up ok when in park.all the tune up things were just done as well as the fuel pump.i began to load the engine up with the car in gear and the brakes on but the engine stumbles.after several attempts the adjust the air/fuel mixture and try loading it up again it backfired through the carb and stalled. i fired back up again and loaded it up , no hesitation. i drove it around the block and it ran great. when i got home i turned it off(5 minutes) then started it again to make sure but the hesitation was there again. i sent the carb out today to get rebuilt.the original holley 1920(same problem)was swapped when i replaced the head(new design,no plug tubes,1976 volare?)with another carb(1 brl,told its a holley,no holley markings?)is this a carb issue? or should i be checking elsewere?and what kind of holley is it?
