Audi0s

The car wont start in the morning, but if i can get it started itll run great all day, untill it sits all night...im pretty sure i have an early 97 1.8t with the 3.5 bar regulator...The car will crank, start, then rev to like 1300 (like cold start) but itll die right after..today i tried to change my fuel filter, but couldnt finish due to the cold...i did dpill some fuel, and when i tried to start it again, it ran fine...i am pulling codes of a mis fire on cyl 1 3 and 4...after clearing, no problems, but i fear itll happen again tom morn..any help? thanks-John