got a hell of a issue. when i got the car it had an exhaust leak, and at the time it was fine, after the ride home the car had a miss under acceleration. i had looked at some solutions and did some seafoam and premium gas on the way home from doing that today it ran like a new car no misses no pings. i went to pass someone and ran it to 4500 rpms and it started missing again and smelt like oil bad. i was also missing 2 quarts of oil. after driving for a while it returned to its orginal running state. does this sound like a head gasket or oil rings. i dont see any blue smoke out the back and there isnt any oil on the ground. oil pressure and temp are good oil pressure is middle and temp is 1/4. any help would be great thanks!

 

Would that be a EGR Valve gone bad? i pulled up codes for egr valve stuck open and closed and misfire on cylinder 3. i guess right now i know to replace it, but could the egr valve be leaking oil and that oil getting into the cylinders somehow? thanks again for any input!!