Thanks for all the post's guys!! Yep, i'm straight piped!!! It doesn't smoke when it's missing, at all. My boost gauge doesn't jump or flutter when it does this either although i have had a lot more turbo flutter (fart) when I let off the go pedal under moderate acceleration. I also thought it could have been a tranny problem but my RPM's don't jump around either.. I'm leaning more towards a leaky EGR Cooler or Low fuel pressure.. What do y'all think.?.?.?.?