after 5 minuets i was trying to excelarate when the speed limit turned to 55. no more power so i pulled over checked under the hood.there was some smoke may bee axcel geese from blown boot. but was ode was that the muffler pipe was red hot after the cat converter. its anew cat new coil new wires and plugs new knock sensor, its not overheating. idles fine. now i'm stumped.