'03 Fse 400 Dies when dumping throttle abruptly after high rev.
My 400 is up and running again but one of the original problems is still a problem after the rebuild. Whenever I'm at high revs or full throttle and come to an abrupt stop, turn etc where I have to dump the gas it completely loses power like you turned the key off. Once it dies, as soon as you hit the e-start it fires right up and off you go. Only seems to be a problem at moderate to full throttle and then dumping it. If I'm at low to moderate throttle or if I blip it down from high instead of a quick dump it seems fine. Any suggestions? Also an occasional backfire from high to low but from what I understand that is normal?
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