Hi everyone....I posted the below attached posts on another Ranger Forum but don't seem to be getting a whole lot of feedback over there. I'm really at a quandary as to where to go from here and was hoping I could find some resident experts here that I can glean some info from. I cut and pasted the posts below: I have a "new to me" 93 Ranger 4x4 that I bought with a leaking and slipping A4LD transmission in it. I decided after researching the trouble prone nature of those trannies to convert the truck to a 5 speed. I swapped everything over (to include the ECM computer from auto to standard 4x4 model), got everything done and noticed truck seemed to idle pretty high, even after being warmed up. Side note: To be totally honest, I believe this engine run-ability/drivability issue was there before I swapped it over because it died when doing sudden stops on the way home with it too. But...it was leaking so badly, I never really got the opportunity to get to know the truck before tearing into it because it was leaking tranny fluid and slipping so badly. On initial start, with original FOMOCO IAC still installed, it started up at 1800 rpm, dropping down to 1000'ish when warm. I unhooked IAC wires, no change... Installed a new IAC...whoa! Revved to 2500 rpm cold start, settled down to 1000'ish when warm. Cleaned MAF with MAF cleaner. Checked throttle stop screw and it was set correctly. Carefully sprayed carb cleaner around vacuum lines, PCV Valve & hose, intake joints....no change. With old IAC installed I can live with the idle and drivability except for when driving along on flat ground. It acts like cruise control is set at any speed above 15 MPH. It will literally stay at 1800 RPM's at anything above 15 MPH on flat ground, foot off accelerator it just putts along on its own. With the new IAC installed, its even worse...hauls butt above 15 MPH because idle wont settle below 2300 RPM's even with foot off pedal. You literally have to drag the brake to slow down on level ground. I'm at a loss here and could really use some advice if there's any out there to be had? I've search functioned this to death, but this situation seems unique. Oh, another thing its doing and has been since I attempted to drive it home....may, or may not be related...the speedometer is consistently reading about 10 to 15 MPH high as checked against my GPS. I thought maybe the VSS was causing an issue with computer when driving, so I swapped it out with one from the 5 speed donor truck, still no difference there? I'm a retired aircraft mechanic that knows my way around a wrench and a multi meter, so I can troubleshoot if pointed in the correct direction.