2006 check engine light came on and RPM slowed to 2000

the timing may be off. It needs tobe calibrated.

If it starts and idles about 2000 to 2500 rpm and won't slow down about 90% of the time replace idle up motor(sensor)

number of possibilties including fuel filter, fuel pump, defective fuel regulator, an ignition problem, or possibly a clogged catalytic converter-are there a check engine light? Does it only do this when cold, or warmed up, or all the time?

A few possibilities.... bent rim, broken steel belt in tire, or a wheel weight that keeps the tire/wheel combination in balance has fallen off. Not sure how big the bump was, so other options would be suspension related. I would check the tire and/or wheel first.

Maybe a short to the TPS or something shorting it out. There's also the IAC that really controls the idle but usually it will cause the RPM's to go up and down a little erratic if bad. The MAF sensor can cause major problems as well but since you already swapped the TPS and it helped and then stopped I would focus on that sensor and especially it's wiring to and from the ECM. Be careful with the sensor signal wire to the ECM can blow it if more than 5v passes or spikes.

The most likely cause of this would be an air leak somewhere. Have a good look round (especialy around the throttle bodies) for anywhere the engine could be sucking air.

check operation the throttle control motor or cable if used ( broken /missing return spring

I've seen this a lot it's usually a defective oil pressure sending unit

I tell you how to fix it.
You drive 110.
You crash, and die.
My fault.
No, thanks.

I'm had a similar problem with my Caravan this past October. Ask your mechanic to check the fuel pump and oxygen sensor. There was a recall on Airtex fuel pumps in 24,000 2000 Caravans in 2006, so might want to see if it was one of the affected pumps and it can be replaced for free. Good luck!