Being that this truck has been through some harsh and corrosive conditions -- Follow the evap line from the fuel tank module to the evap canister. This line can rust and corrode. Closely check for rot and/or cracked fittings and hoses in the evap line from the fuel tank. MAKE SURE this line is not blocked or broken in any way. This code is a code set for a blocked or failed evap vent line.
Also, check the fuel inlet hose and vent hose for any issues. If all this fails, have the computer reflashed -- if that fails then it is probably a computer issue.
BTW -- Test things before you go changing them. The TPS signal voltage should go from (approx).4 volts and increase to around 5 volts when you open the throttle. It should do this smoothly -- If it doesn't then (and only then) change it. Just throwing parts at it will cost you in the long run. Test - Confirm Condition - Replace or Look elsewhere for problem.
Thursday, May 27th, 2010 AT 9:27 PM