Check engine light came one. The two codes are P0442 and P0446. Any ideas?

There was also a misfire code on cylinder 5, so I replaced the coil and plug.

There's hesitation when driving about 50-60mph. It also stalls when I come to a stop.

2004 F150 5.4L

 

P0442 - EVAP Control System Leak Detected (Small Leak)
The PCM monitors the complete EVAP control system for the presence of a small fuel vapor leak. System failure occurs when a fuel vapor leak from an opening as small as 1.016 mm (0.040 in) is detected by the EVAP running loss monitor test.

• After-market EVAP hardware (such as fuel filler cap) non-conforming to required specifications
• Small holes or cuts in the fuel vapor hoses/tubes
• Canister vent solenoid stays partially open on closed command
• Damaged, missing or loosely installed fuel filler cap
• Loose fuel vapor hose/tube connections to the EVAP system components
• EVAP system component seals leaking (EVAP canister purge valve, fuel tank pressure sensor, canister vent solenoid, fuel vapor control valve tube assembly or fuel vapor vent valve assembly)

P0446 - EVAP Control System Canister Vent Solenoid Circuit Malfunction
Monitors the canister vent (CV) solenoid circuit for an electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified canister vent duty cycle by PCM command.

• VPWR circuit open
• CV solenoid circuit shorted to PWR GND or CHASSIS GND
• Damaged CV solenoid
• CV solenoid circuit open
• CV solenoid circuit shorted to VPWR
• Damaged PCM

To verify normal functioning, monitor the EVAP canister vent solenoid signal PID EVAPCV and the signal voltage (PCM control side). With the valve open, EVAPCV indicates 0% duty cycle and a voltage approximately equal to battery voltage. When the valve is commanded fully closed, EVAPCV indicates 100% duty cycle, and a minimum voltage drop of 4 volts is normal. Output test mode may be used to switch output on/off to verify function.

 

I replaced the purge valve. I'd also like to replace the fuel filter and gas cap for good measure.

I'm going to check the codes again tonight to see if replacing the purge valve removed any of the codes.

Any other ideas? By the way, one of the hoses running from the purge valve seems to be dry-rotted. Could that be causing it? Perhaps I should replace that as well.

 

Do you think cleaning the throttle body will help with the hesitation and stalling?