I have toyota previa 1994. Van starts fine in the morning but after that causing problems. After that if I stop somewhere turn off engine and then start it takes at least 4 to 6 cranks then to start. When stop at light it loose power then turned off. One more thing I want to mentioned in the morning first start and after some running when it is idle VAN accelerate itself. I have changed spark plugs but still same problem. Please help I am student can't afford to go to autoshop. Thanks.

Well, you probably have a very gummed up throttle body, and egr passages, and idle air control valve.(IAC).
You need to replace the ECT sensor. That's the engine coolant temp sensor which controls you fuel injection volume.
Passenger seat removal is required to get at it.

Can you please tell me where it is exactly under seat and how much it will cost me, please. Thanks

It will cost you about 75.00. You must lift the passenger seat out, and bracket for the seat, door sill plate, lift carpet, there are 12 (12mm bolts) that hold the floor pan down under the pass carpet.
The ECT sensor is forward of the valve cover sitting on top, and has a green connector going to it. You can't miss it.
It will greatly improve warm up performance, but you sound to have other issues going on also.
I highly recommend changing out the spark plug wires while you're in there if needed. It's your call/money. GET TOYOTA PARTS!

OK I will try and let you know in few days.

ok I will try and let you know in few days.

If I just unplug the etc sensor will VAN work also I don't want that sensor if van works without it .

If I just unplug the etc sensor will VAN work also I don't want that sensor if van works without it .

Remember the ole' saying. Garbage in, garbage out. If the computer sees garbage inputs, then it runs like garbage.
Computers NEED to "see" these sensors. If they don't, the old Previa will fall flat on it's face!
Am I right, fellas? Give me a golf clap on that one. 26239
To answer your question, and your PM, NO! Do it right, do it once!