any ideas why marea 1.6sx (w2000) should run intermittently ok then very rough. it is at fiat as we speak but they have run out of ideas after replacing fuel potentiometer that showed faulty on diagnostics. however still not running properly so checked jets, timing, fuel pressure etc. if i remember properly they said air is popping through inlet manifold under hard acceleration but cant find out why. sorry this is a bit vague but would be grateful of some pointers as to intelligent questions to ask before i shell out £500 quid for car that sounds like same problem as what went in with
cheers
cheers