From 2500 RPM on up under anything other than light acceleration, I get a ticking sound from ??. As soon as speed levels off the sound goes away. Checked all my vacuum lines and all that, and everything looks okay. Any ideas?

Exhaust leak?

exhaust leak my firt guess also check and see if something might be rubbing on the belts. Remember the motor tends to rock when under load and when you settle down on a speed the motor moves back to it's neuteral position and not rubbing anything.

Looks like I have a possible leak around the EGR pipe where it attaches to my back header. Won't know until I get a chance during the day to try and snug it up, maybe. Thanks guys.