rk done on engine is good. I would suggest to go only for emergencies. The only trickiest part is- I heard mr. Hassan talking on phone to other cutomer that we will do this and this but would not garuntee whether it will work. First thing he will do this and check to if there is other problem need attention to fix completely. SAID SAME THING TO ME TOO. PLUS+ CHEAPEST GAS AROUND ASPEN HILL AREA - ANYTIME....