So I've fixed up my mustang (2005 4.0 V6) and its running. but the car speedometer is messed up, (will say I'm going 80 when I'm going like 40), The car wont go past 2400 RPM, and seems to not want to shift at all, almost like its stuck in 3rd gear. It makes a pretty big jolt when shifting into reverse, and has a top speed of maybe 50 mph. The only code im getting though is p0174 (System too lean cylinder bank 2). another extremely odd thing that im going to check out tomorrow is that when i press the overdrive button, the anti theft light turns on and the car loses all power to the engine??? any help would be greatly appreciated