You did not previously mention the sluggish performance. Perhaps you should update the current conditions?

I thought the work flow diagram was a great idea, why haven't you completed it?




Regardless, I have been watching this thread... its driving me nuts. I can't honestly say I am familiar with these engines, but here are my top interests:

- EGR, A minor malfunction could cause poor running... however, I am not so sure it would cause such a large drop in MPG. But disabling it should be easy enough.

-Brains... who is making the decision to run rich with sensor input (swap another good one to test for a few weeks)

-throttle position sensor (there is something to that effect, correct?)

-maybe an early exhaust leak or a late intake leak

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