2001 Ford Ranger NO CODES

For the rough idle try using some choke cleaner and clean the throttle plate on both sides, maiking sure to clean the iac area as well. The truck may start hard after doing this. Make sure to hook the air duct up properly as well. Then after you get it running put a vacuum guage on the truck and taek a reading. It should be 20" if it is around 15" your converter may bebad. Other than that you would need o check your crank sensor as theycan go bad and not show a code.

If you unplug a sensor it won't kill the engine, it just goes into open loop that's a saafety feature. If you are getting no data from the one sensor, then there is a flow problem( possible cat converter) or the wires aren't sending through to the computer. Or the wires are grounded someplace. Before youreplace an item like a module have apro look at it as you've dumped a ton of money into it already and still not fixed the problem. Ther may be a tech bulletin out that you don't have access to that tells how to fix the very thing you have wrong.