i observe the car for 2 days and it drives fine but like i said there are times that it would sputter an jerk,but sometimes it'll just jerk but no sputter,then yesterday i went to wash my car,i noticed after the car wash the car starts sputtering and jerking so bad sometimes backfires while decelerating but it still idles fine,but couple times the idle dropped really low but went back to normal,and i can here this low tone hissing /squeaky sound coming from the driver side of the hood,i can hear that even before but i'm just ignoring it coz it's not doing anything anyways,do you think theres some water went to the tank ? gas line? have no idea, it was fine before the car wash. gas cap is on, and by the way my trunk has a leak everytime it rains water goes in the trunk where the spare donut tire is at the bottom, but i don't think the gas tank is below it or is it? my car is a 94 civic coupe.please reply