I just bought this truck and it is being very difficult, i see a bunch of threads and google topics with the same problem but i never see where anyone posts how to fix it. It starts and idles fine, normaly, but when i go to drive it has no power, cant go over 30, have to apply the gas very softly if i push to hard on the pedal it boggs down. I thought it was cloged cats so i cut them but it made no difference, the only codes its reading are oxygen sensors but no check engine light it on, it has a new fuel pump, and i can see where someone has removed the intake and put new seals, as well as a new mass airflow sensor and altenator. It is running on all 6 cylinders. I dont know what to do, i think it might have a bad ecm but i dont want to go just buying parts that dont fix it, thanks

 

Have you removed your EGR valve? Clean it out so that the spring loaded pin moves freely. put it back on and see if it helps. I say clean it first because there not cheap.