I recently had my gas tank and fuel pump replaced on my Cobalt. All costs covered by a recall through GM. After the mechanic was done I took it home didn't notice anything tell later in the day when it started cutting out around 2000 -2500 rpm check engine light came on. So I scanned with ob2 reader, 2 codes popped up. 0171 and 0171 pd. Basically I have a lean bank either not enough fuel or not enough oxygen. It's the weekend so can't take it back tell Monday. Any easy fixes you guys can think it might be? I'm changing the fuel filter today.