Have replaced gas cap, purge valve, pcv and grommet. hoses look good. Any suggestions. Light is still coming back on. with same code.

 

have u replaced the evap canister? we have a lot of problems with those at the dealership ppl drive down dirty roads alot and they get plugged with dust.

 

I'm assuming you mean P0440... check everything around the canister... do you smell gas ?

 

sometimes people forget that air filters and, fuel filters, fuel pressure regulators are all integral parts of the emission system.......... when did you change the air filter last? i would start there by checking it, then clear the code with a diagnostic tool.