Thanks for reply yes kept same throttle body and pleneum plug leads all connected when engine was out of car but will double check, the pipe which blew was on same side above air con pipe. don't think the cats are blocked as it runs fine when engine is cold,how can i check if they are blocked and how can i cure it if they are ? seems like there is plenty of pressure coming out or exhaust. many thanks for all your replys. i may sound stupid but what is the sai again
am getting old and can be quite forgetfull