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Start by replacing the air filter and checking the operation of the fuel pressure regulator. Have the stored codes read out of your ECU, either by an auto parts store or a local mechanic, in order to ascertain a starting point for diagnosis.
Have you had your fuel pressure tested? Low pressure and/or volume could cause the truck to idle normally, but not be able to take any load. There is a very high failure rate on these fuel pumps.
It may be the throttle position sensor. You should have a check engine light on in your dash. You will need to have someone plug a OBD II reader in and retrieve the code.
You can spend a LOT of money just putting in one part after another.
Please let me know what you find.
Hi,
The air cleaner mighty be clogged causing insufficient air supply. That is why it runs fine on idle because less air is needed and when the engine demands for more air, there isn't enough.
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