p1174 and p0455
I keep getting 2 codes coming up on my 2006 Saturn ion. One is P1174-which I read to be Fuel trim cylinder balance malfunction and P0455-Evaporative Emission System (EVAP) Large Leak Detected. I have replaced the gas cap, the Purge Solenoid and the Vent Control Solenoid. Upon doing this I noticed my Fuel tank pressure sensor looked loose, so I took that out and cleaned it up and put it back in(there was dirt on seal). I reset codes and so far P1174 has come back on. What do you guys recommend doing next? I don't want to replace tons of parts to find out it was all one thing. Thanks in advance to everyone for the help.