95 wont idle

i have the 95 caravan 3.0L.the problem is it will not idle. it will run fine at high rpms but as soon as i let the gas off it will die. i took the plugs out today they are worn with a little black carbon deposits on all plugs. so im going to put new plugs and wires on it but i dought that will fix the problem. the other problems before this problem with the van is some days it will run good and other day it will lack power. anybody have any imformation on this problem?
thanks
yezek6

check the idle air control valve

is there away to clean or diagnose the tps sensor?

the tps is located on the opposite side of the throttle linkage...if you dont get a code for it i wouldnt worry about it..it just tells the comp the angle of the throttle, the car will idle even if the sensor goes out..usually the sensor will go out of range and then set a code before it gives out. The problem with the van is that the idle air control motor has stopped working...locate the motor and remove it from the throttle botty.. it will have a rounded end, attached to a shaft that sits in a motor..the shft is threaded and the motor spins the shft in and out , depending on engine speed..(works like putting a screw in a hole to stop a leak.)
When you get it out unscrew the shaft from the motor and lube it up..make sure it spins freely..screw it all the way in and put it back in the throttle body...when you start the car it will probably idle at 3000 rpm's..just let it sit and run for a min....it will take a sec for the motor to spin the shaft in...if it idles then you can probably drive it for a little while...no guarantees on time...
If it stalls again take the the iac motor out and see if it has tried to move the shaft out..if not then replace the iac motor...make sure you check for power and ground also ....your book will show you which wires to check...

You're headed in the right direction with the plugs and wires. While you're at it, go ahead and check or replace the gas filter.

You're stalling problem is more that likely caused by a very dirty throttle body and idle air control motor. Get some cheap aerosol carburetor cleaner (maybe 2 cans) and an old toothbrush. Clean the throttle plate and bore in the throttle body.

As joe stated above, remove the idle speed control (ISC) motor from the throttle body. Clean the pintle and shaft on it. Make sure to keep the electrical connector end up while you're spraying the carb cleaner on it. Do not allow the carb cleaner to seep back into the part where the electrical windings/motor are. Don't forget to clean the opening from which you removed the ISC.

DO NOT DISASSEMBLE THE IDLE SPEED CONTROL MOTOR.

After you have made the repairs and reassembled every thing, turn on the key momentarily and then turn it off. This allows the ISC to find its position.

Start the vehicle. It will probably be hard to start as if flooded. This is normal unless you remove the throttle body to clean it. Once the engine starts, it should idle properly. If it still does not, suspect a bad ISC motor.

A quick check for this is to pay attention to the engine when it starts. Upon startup, the engine should flare (hit a higher rpm and settle back to normal) momentarily. Additionally, notice the tach. Turn on the AC, the rpm should increase slightly 50-150 rpm. If none of this occurs, the ISC motor is probably defective.

thanks to the people that replied to my post the van is running good now.
thanks
yezek6