I assuming no warning lights? If none, then try the throttle cable mod and maybe a tune up. I guessing the Throttle cable mod will fix your problem. Where ya at in CO, I'm in Brighton.

http://www.fordrangerforum.com/how-s...cable-mod.html

Good luck

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(SOLD) 2003 Ranger 4.0L V6 FX4
2001 F150 Supercrew Triton V8 (DD)
2008 Fusion 3.0L SEL V6 (my baby)
1992 Taurus SHO MTX (my toy-almost Supercharged)
2004 Nissan Murano SL AWD (Wife's car)