Ford Topaz 92 problem

I have a Ford Topaz, the fault is the following is battle to light it, and when it turns on, it batters to keep it in reling per ke goes out, and I have it to leave accelerated for a good time. I already kambie several times the valve by Pass, refines everything to everything and remains the same.
I put an original, I smell a time well and then I returned to the same thing, I bought a new one and with that it did not work only as, if it was going to be unleashed (it is accelerated without control, I connect it) to connect it if Alguen gives me an idea of ​​that it is the fault by which the valve does not work.

What engine does that Ford have? I do not know her like Topaz, but I spend with a currier and it was a triumph to find the fault, it was a plastic body that goes inside the multiple of admission behind the accelerator body.

Thank you for answering, apologizing, I forget to put the KE engine, it brings the car, it is a 2.3 lts and the keys are not plastic are made of aluminum, what is plastic is the valve by pass, in those models they came out of plastic and in the previous Ke is very similar to is called Ford guia, but that brings 3.0 engine still the Ford Taurus, sorry for what you are, I hope you can help me and thanks for the attention.

I am from Chile, but it seems to me that this drama you have passes through the temperature or oxygen or flow sensor, will you have to proceed, because once the vehicle is heated, right right?

My friend the oxygen sensor is new, the temperature changed it for an equal but not new and if you refer to the flow, like the MAF sensor that also put it new, and the truth I see the same, I just now caused something else, bell and heat up.