Hi guys im having problems with my ute,when i start it it wont rev for a while then all off a sudden it revs,also its back firing throught the carby and even lit up today like a top fuel dragster.Also while driving its retarded then it will jump like its got a turbo on it and then off it goes.What do u guys think are the problems and yes i know im going to have to spend some money on it at some stage.