engine runs rough after warming up for 5 mins , bucks while driving and hesitates and Mpg are bad
changed out plugs , wires ,coil pack ,fuel filter , mass air flow , EGR , EGR sensor ,Idel control sensor . No codes and check engine light is not on .

anybody else seen this problem ? anything i'm missing at could cause this problem .

 

Even though its not yet thrown a code could the CAT be clogged or the O2 sensor giving you a problem?

Are you sure the bulb for the CEL is working? Mine is constantly on due a vacuum leak not yet found/fixed---one I've cured this condition I'll replace the bulb just to be sure it is working.

Let us know your results--might be helpful to someone else down the line------best of luck too!