gas caps only 6months old, plug gap is within spec, no leakes from fuel tank had this truck on hoist many times, never saw it leak or smell any gas that would cuz concern, the other night i took it on a drive a nice 1hr-2hr drive just driving around to let the truck go thru a full warm up been cold up here in michigan for the last 3 months, drove it on country back roads, some highway, and dirt roads,turned off the radio just listen to what the truck was doing, thinking maybe i missed something seeing how the truck never gets that kind of drive yeah it gets warmed up, but never a real long drive like that, so as im driving mostly doing between 55mph and 70mph on these snowy icy roads, seeing if anything changes basically looking for anything that missed, on the way back i was on a really bumpy section of hwy and i was about 10-15mins from at this point and suddenly the pitch of the engine changed, it went from normal sounding to kinda loud almost like an exhuast leak, so i get back with the engine still running i open the hood start looking at the manifold and flange and then i noticed it, so it hasnt been running any codes saying somthings up, and from the full warmup of the engine and getting to true operating temps for a consistant peroid of time the EGR line that i had welded back on had broken free, and that is the problem, well i could do a couple things and im already prepared to try one of the following, the 1st one is just buy the new egr feed tube(88.95 at the local Napa store) but the problem with that is theirs a good chance that whats left of the EGR tube on the manifold wont come off, 2nd i could weld the old hole on the manifold shut and relocate the egr downstream more where the rest of the exhuast has already been replaced, or my other option is to sleeve it which im not a big fan of using 1/4 inch or 1/2 inch copper flex pipe that has a melting point of about 1980F, so i should be more than ok , but what also could do is plug the old port on the manifold and run copper tubing downstream a lil bit not much it but the exhuast gases would be much cooler than before