have had a hard start when facing up hill all the fuel return seals replaced. Now if its pointed up hill and plugged in at night it fires right up, and i have a p122 code,the hard start started when the weather started getting cold could use some input diagnosis on this. thanks

 

P0122 Accelerator Position Sensor (APPS) LowAPPS Voltage Input Too Low

Mopar1973Man's Dodge Cummins Articles - P0122 APPS Sensor Signal Voltage Too Low

 

the uphill hard start was a fuel return line leak on the back of the head and the fuel pressure guage line was letting air in,the 122 code i think was low batteries or a ground,erased code hasn't come back.