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Hi Tom your vehicle is equipped with a Rev limiter it will not allow you to rev the engine above 4000 with the trans in park; as for the first problem you may have one of two things, one of the spark plugs or spark plug wires is bad or you have a flat spot on the throttle positioning sensor in which case have be replaced. Good luck?
Probably not the ECM. Have it scanned. IF is is a 93 it means you have a 4.9 motor. They have a solenoid idle cotroll that could be malfuntioning, there could be a problem with the throttle position sensor, or maf, egr,mass air flow, You get the picture. The light is on to tell you what is happening. Most Autozones and Advances will scan it for free. Good luck.
Honestly I wish I could offer you more info, if it revs now that eliminates the convertor, only I can figure is when you got it to rev you were "blowing the soot out" LOL I hope I have helped you some if so please rate me accordingly.
I'd lean toward the MAP/MAF sensor because of the rev limit. A car with a bad O2 sensor will still rev to redline - it'll just be running rich the whole time. Some manufacturers put in a rev limiter that kicks in if the MAP/MAF sensor goes bad, so I'd lean that way first. Clean the electrical connector with contact cleaner, and run a half a can of Seafoam through the vacuum system - this may clear up your issues. If not, I'd replace the MAP/MAF sensor before the O2 sensor.