Engine idles around 2000 rpm when in park. Dont knpow how to lowere idle speed

I think should be around 750.

belt worn, loose or idler pulley weak --compressor clutch binding,moisture in system ,compressor internal damage

The idle air control solenoid is very common to quit working. The only other thing would be a large vacuum leak.

All the above is normal , except 2000rpm is a little high at idle . can be adjusted down to 1500rpm. the computer adjusts the engine speed . in drive the transmission loads up the engine idle drops to 1000rpm . in park engine unloaded rpm increase all normal.

which engine.??? never post lacking engine ,here is why.
1.3 L G13B I4
1.5 L G15A I4
1.6 L G16B I4
1.8 L J18A I4
1.8 L BP-ZE I4
1.9 L XUD9 diesel I4

Ill answer in the generic and for GAS engines. only.
that is illegal RPM, the ECU regulates it to 800 all the time
that means the ECU can not regulate the RPM now, for many reasons.
and sure it vibrates too low, that is normal for all 4cylinders to do that.
no bad engine mounts never lower RPM to 600, ever.
they dont control idle speed at all.
the #1 reason for most cars to idle too low are:
1: EGR leaks, (clean it)
2: ISC stuck closed (electric idle speed acututor dirty) clean it.
3: gross misfiring , caused by bad spark or bad fuel mix.
4: low compression on 1 or more cylinders (real low) Do compression test at WOT. throttle.

Have you tried cleaning the throttle plates and idle air control motor

lower the idle switch,might have to have mechanic do it if u dont know where it is,wont cost alot,very easy

you only set base timing to 15 degrees BTDC (before top dead center).

Ignition Timing

1. CAUTION: Parking brake control should be applied.
   Depress the parking brake pedal, and warm the engine to the normal operating temperature.

1. Turn off all electrical loads.

1. Rev the engine to 2000-3000 rpm two or three times and allow the engine to return to the idle.

1. Turn off the engine and disconnect the throttle position sensor electrical connector. (not really necessary)

1. Start the engine and rev it to 2000-3000 rpm two or three times and allow the engine to return to the idle.

1. Check the idle speed. The idle speed should be between 700-800 rpm in PARK (P) or NEUTRAL (N) position.

1. NOTE: Make sure that the timing pointer is pointing to the 15° Before Top Dead Center (BTDC) mark on the crankshaft pulley. Each notch on the crankshaft pulley represents 5 degrees.
   Check the ignition timing with a timing light.

go here for villager help

http://autos.groups.yahoo.com/group/villagerquest/

hello, i first must ask why that engine would EVER be reved to 4000 RPM? it is likely you are up against the rev-limiter and your ignition is made not to over rev. be very careful....4000 RPM on that engine could/will severly damage your tourque convertor........very expensive it is common for the EGR passages on that model to plug up with carbon, remove valve, clean ports, and retest for low speed miss/hesitation, good luck....marty

normal for an engine to start at elevated rpm and then die back as it takes a few seconds for the ECM doing it's sensor checks and idle back to the correct idle speed
check the idle rpm with an external rpm counter as most in dash units are inaccurate at rpm lower than 1000
as for the temperature
If you have a climate control module, it uses a mixture of heater and ac to maintain the temperature that you have set
so check it for operation