[USMCpoolee]

My 2003 f350 lifted 6incehs and 35 is surign and shaking really bad all the time what could the problem be

 

[RescueF250]

Injectors tend to cause the shaking. This is a simple way to do it, get yourself a Temperature Gun read each exhaust port closes to the block and see the temps, if there is a big difference in temp range on one cylinder then you might have a bad injector.