I live in the middle of nowhere so performance shops are out but I will try a new box and see if that helps also will check the distributor cap , thanks for your input
The last owner installed the hemi and drove it about 75 miles said it scared him so he parked it for about 9 years ( he was 75 at the time) said he started it every couple of weeks to hear it run. this is a mopar crate motor so i think it is a mopar manifold single 4, 850 CFM idles great also...
The last owner installed the hemi and drove it about 75 miles said it scared him so he parked it for about 9 years ( he was 75 at the time) said he started it every couple of weeks to hear it run. this is a mopar crate motor so i think it is a mopar manifold single 4, 850 CFM idles great also...
here's what I have, just got a 70 cuda with a 472 hemi auto tranny it starts good runs good idles good burns the tires good until i hit wot then it backfires and runs terrible until I let off runs good right through 3/4 throttle it has a 4150 holley vacum secondaries jets are 80 front 82 back...