he said that when he tries to fire it up it always takes 3 tries and it starts on the third, and that it will run for a couple seconds and die.........he said the last time he tried it ran for about 10 seconds and then backfired and died.........what could be wrong.......he said that he has given it a complete tune up and changed almost everything but the TPS on the fuel system.......he also changed the computer........anyone have any idea's?

thanks

 

No real ideas, just the usual questions... what year, model, and fuel system?