Sounds like you got a vacuum leak somewhere on that thing. Do you hear any hissing while its running. You can take some carb cleaner in aerosol can and spray it around the intake while its running to check for vacuum leaks. If it has one big enough the thing will change idle. Visually look for some sucked in vacuum lines on that thing. There is an IAC valve on top of the throttle body tap on it with a screwdriver and see if it idles. Lastly I hate to tell you those things were bad for upper plenum gasket leaks, you will need the upper plenum oring gaskets 6 I think, and the isolator bolts that hold it down, and 1 big upper plenum oring gasket. And the pcm will need a reflash when done should take care of the Check Engine Light.
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Leaking fuel injector bank 1 - EGR stuck open - Engine mechanical condition
1152: Oxygen sensor rich,
Some vehicles built prior to june 8, 2001 may exhibit a cold engine rough idle and / or a malfunction indicator lamp light with diagnostic trouble codes p0171, p0174, p1132, and p1152 in memory.
CODE P1132 LACK OF HO2S SWITCHING HO2S SIGNAL HIGH INPUT. CODE P1152 LACK OF HO2S 21 SWITCHING HO2S SIGNAL HIGH INPUT. LEAKING SIDEWALL ONE POSSIBLE CAUSE IS HIGH FUEL PRESSURE.AND LEAKING FUEL INJECTORS.YOU COULD HAVE FAULTY FUEL RAIL TEMPERATURE PRESSURE SENSOR.
I have same van (2001) a relative give me. My uncle (orig owner) have a recall card from ford for SPEED CONTROL SYSTEM MODIFICATION..maybe this is the problem. my van is doing the same thing like yours...no codes.. but sometimes the odometer wont go higher than 35mph...
Try looking at the idle/air control valve - Look around where the gas cables attach to the engine. remove the wires and then unbolt the unit from the engine. The control valve has a spring valve that you can clean with intake cleaner. re-install the valve and drive to warm up the vehicle. After 20 minutes the vehicle should Idle. If not clear all codes and relist them here - hope tthis helps