i run a supercharged 355 with mpfi and 80 lb injectors...the problem starts intermittent either at leaving a intersection or on the highway under cruise...wide band leans out and i get a lean back fire....to stop it i just have to hit the throttle and it stops....help if you can

 

A data log would be helpful.

Is lean cruise kicking in at too low of an RPM/MPH?

RBob.

 

i thought i had lean cruise shut off...must noticed last time i was out on the highway it went full lean ...nothing on wide band then a lean back fire then back to normal with wide band indicating normal...also tried changing afr closer to 14.7 ...will try to get more info for you ..will be taking out tomorrow to get a sticker...i will data log the ride...thanks for the reply