looking for advice/ shudder problem

I have a 1998 tahoe with the 5.7 after accelerating upto and during highway speeds (55mph+) the truck will start to shudder for a minute or so. It will start shaking once you back off on the throttle and try to operate it at crusing speed. If I come to a stop soon enough it will continue to shake even when the truck is not moving. The vehical is not registering any codes with the exseption of the oxygen sensore that shows up from time to time.

Going crazy. Have checked egr vavle, and cleaned many of the sensors, replaced plugs, wires, cap/rotor, fuel pump, and added injector cleaner with no change.

P.S. U joints, idler arm, tires, front axsles, valve body, and front differtial, have all been gone through recently and had no affected on the shaking.

A new fuel filter? Crankshaft position sensor