Ok my civic been having probem. When I try to start up the engine it take a while to get it started up. then when i rev it it make some weird noise i can't really explain it, but it sound like it sucking air and if i don't stop pressing gas it die (and that on nutral).. sound like it coming somewhere from the throttle. but if i press the gas slowly it will go. What I think is the tpi and the map sensor. People have told me it can be my spark plug, fuel filter but i'm not sure so please help. (hope i don't get u guy confuse)