Originally Posted by notastockdohc

Not trying to hi-jack this but mine had a severe shudder/jerk when I first purchased it. It would do it at 45-55mph while shifting into overdrive under a load such as going up a hill. I purchased some low mile 07 mustang gt coil packs and it got a lot better. But I'm noticing say I'm at 50mph and I go to pass a car and I tromp down on the throttle the truck hesitates for a second or two like it has no power then it all of a sudden takes off and down shifts like its suppose to do. Been told it's a programming flaw it's the fpdm, filter ect. I'm lost to. Hell trying to pass people anymore almost gets me killed. But my truck is a 04 fx4 screw with 167k miles. It sounds like a power strike ect lol.