hesitation, high cold idle and poor gas mileage

[sd88supra]

Originally Posted by mrnickleye

You won't have idling or running troubles with plugged EGR passages, or inop valve.

So, what is causing my poor fuel economy, high cold idle (better yet it runs harsh when cold) and hesitation? I've driven almost 9k miles since my last full tune up (plugs, wires, brakes, compression teset, LSD change, etc). I've also noticed loss in power. I think I'll start by redoing a compression test.