hesitation between 1700 and 1900 rpm

[the_legend_1981]

tbi. I really only feel it in overdrive going up a little bit of a grade. It cuts out and then goes back to normal. Any ideas? I'm wondering if my timing could be off

[Captkaos]

Did you find your answer to this?

[the_legend_1981]

Not yet. It's more between 1500-2000. Maybe objectors are dirty?

[the_legend_1981]

Also idles rough in winter months. Could it be related?

[zieg85]

Check your vacuum lines for cracks.  Your temp sensor could be off some not giving the proper air/fuel mixture.  My $.02

[bd]

^ This, and...
1) Check your fuel filter. 
2) If you have a pressure gauge with the correct adaptors, have someone ride with you and monitor your fuel pressure while driving.  Be really careful if you do this - gas in the cab or any fuel leak for that matter can be deadly!
3) Inspect your spark plugs, cap & rotor.
4) When you pull the plug wires off look into the ends of the wires for black soot or green discoloration.
5) A sticking EGR valve can also mimic your symptoms, as well as other things.