Hey guys! New To the site and Im sure there is a thread for this But I couldnt Find one!!

I have a 97 Ford F150 4x4 with 4.6 v8

Engine light came on and started flashing I hooked it up at autozone on a scan tool and it says Bad EGR Valve and Missfire Detected in Cylinder # 4

So I change The Plug (Which by the way is a pain to do) No change Still Missfire and Shakes like it has a tire out of balance goin down the road! So I check The injector with an ohm meter and All The injectors are The same.. I know it still could be a bad injector but for now Im Runnin Some injector cleaner through it! Im Going Tomorrow To get the compression checked.. Hopefully Nothing Major but with my luck It probably is ! Has anyone had this problem? COuld it be something else minor??

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