70 Challenger / 340 / MP electronic ignition with Orange box (>20yr system), Fitech fuel injection.

Car has been running great since the Fitech install over a year ago. I mainly just cruise the car. It never really gets over 2500 RPM since I have 518 OD.

Other day I got on the gas and it sputtered and seemed to backfire. Did this several times each time I jumped on the pedal. Once I let up, it ran great as usual.

Any thoughts on where to look to figure this out?

Thx