i have had trouble starting my v70 awd 2.4 99 i cranked over but wouldnt fire up aventurly it did but got 2 mile up the road and and it died managed to bump bk to life but need to know whats happning the engine management has been popping up i was told the cat was showing up on the diagnostic could this be the reason the cat dosent seem or sound gone there is no nasty rattle i tryd revin up to the max only went to 4k on rev meeter any 1 got a clue 4 pls