4.0 too much fuel

[Eviltruck]

The truck ran great, Had a check engine light on. Plugged a ohm tester into the odb1 plug in the engine compartment and the separate white single pin plug, like the book told me. Now the truck won't start, too much fuel. If I disconnect the relay for the fuel pump it will start but runs bad and idols high if I plug the relay back in it will go but slow and sluggish I tried to replace the mass air flow censor with no luck. Any Ideas??