I just bought my first M sled last year and it ran great but, it doesnt want to idle -it is a M7 w/boondockers fuel controller (also nitro too-but havent used it yet) its popin and sputtering and dies if u don't throttle up on it. Put new plugs in it check compresson-what could it be?
Could be water or contaminants in the fuel. I've seen both before. Pull the fuel line off of the throttle bodies and put it in a container while you pull it over a few times and check to see if it is clean. Might also be a tps problem.
Could be that your throttle cable is to tight, if its even a little to tight and the butterflies are open even a little the ECU will sense that and shut it off or it will pop and sputter. This is common when people re-route their throttle cable around the other side of the motor.