I have changed the following things on this motor according to the codes it has givin me. both 02 upstream, twice on bank 1,fuel pump,fuel pressure regulator,fuel filter,pcv valve and hose,egr valve and regulator,dpfe sensor,maf, air temp sensor, took throttle body off and cleaned the holes out. The truck runs perfect in cold weather. When the air temp. gets above 60 degrees it starts to run bad. Does anyone have any ideas on what i should do next?

 

The codes did not tell you to change anything.
You waisted a lot of money and effort as you found out.
What are the codes, then we will suggest items to look at.
Explain what bad running means.

 

I have had several codes, the very first code i had was i believe left bank 02 sensor. The engine was hard to start and would have to feather the gas pedal to start it. When i replaced both 02 sensors it fixed that problem. Then about a week later it started to give a lean bank one code. I talked to a mechanic said to replace the fuel pump and fuel pressure regulator. Also fuel filter. With over 200,000 miles on it it needed it anyway.The truck runs really good in cold weather below 50 degrees. When the temputure gets above say 60 degrees with humidity it stumbles going at a steady speed,but not all the time.

 

The codes that i have had are 402, 1131,171.

 

Please understand I am trying to get you to see another perspective and not just to be difficult.
....First, your mechanic told you to do something without any proof. Don't do things that way unless money and time is no object..
....It costs you with no benifit.
....Changing filter is fine, it's a maintannce item anyway.
....Feathering the gas pedal has no real effect on startng but leaves extra air in the IAC should take care of, at starting.
....Going on, the 402 code is a 'self test' failure of one aspect of the EGR system.
....It is saying the test detected to much flow during the test routine when there should not have been any flow.
....Causes: stuck open EGR, faulty DPFE, blocked orface in the metal tube between the exhaust manifold and the EGR, stuck open EVR that gates vacuum to the EGR and may hold the EGR a small amount (clean the sponge filter under the round cap and clean the valve with throttle body cleaner), DPFE connecting hoses faulty.
.
NOTE: This 402 code fault has brought to light the faulty coil issue that causes the stumble; as a "secondary" fault and causes hard starts and loss of power.
.
....The code 1131 goes with the 171 code. It's reporting the same fault from a different source. When the fault has been cleared, both codes will clear.
....It's bank 1 OX sensor not switching report. It's not the sensor!
.
....Lastly, the stumble you mention is likely one or more faulty coils on bank 1 where the OX sensors are detecting a rich condition because one of those cylinders that may be passing to much unburnt gas through. This is not good for the cats on that bank.
....If unburnt gas is passed to the cats, it ends up being burnt in the front cat and overheating it to the point of melting. Then you have the expense of replacing the cat assembly on that side.
....Bottom line is you have at least 2 issues at the same time causing confusion unless they are recognized as such from the codes and drivability as I tried to seperate out and show.
.
Again don't change parts on guess and a hope.
I gave you the back ground and where to look. You need to do the work and find out what hardware is at fault.
Good luck.

 

checked the coils out, they are good. Now that the air temp. has dropped below 55 deg. the motor runs better. It no longer stumbles at a constant speed. It does'nt runs perfect but there is a difference. What would cause it to run like this?