acceleration problem

Good morning everyone from the group, ... I have a 2002 Explore with a SOHC 4.0 engine, it is giving me problems, the time chains changed because they sounded and did not accelerate, it turned well on, but it does not accelerate it is turned off, keep its minimum check the crankshaft sensors, cam, the acceleration body, the gasoline pump what I have not done is scanner to the computer any suggestion.

Check the air flow maf sensor since when you accelerate it, you stop the engine.