Acceleration in Jetta 99 2.0 standard

Good afternoon, I have a doubt with a 99 2.0 standard jetta, I will explain it in parts to try to make me better understand and see if someone can give me relevant data.

1.- When lighting the engine does not revolutionize cold enough, so that it does not go out I must step on the gas and reach good revolution until hot.

2.-The engine goes out constantly while driving, this happens when the speed decreases (this is something risky more in the turns), either when I stop total or decrease speed at some return or simply leave it neutral and go alone with the impulse it carries.

3.- There is a time that in the change of acceleration (when I put the change and accelerate), it makes a small explosion, I would not know how to explain it differently.

They tell me that this can be due to failure in the acceleration body, that if I want to change it, it would have to reprogram it (this part does not know how true it is).

Anyone who can give me data about it?
thanks and greetings beforehand and greetings

Hi, take out a engine photo to see what model it is if it has motorisada butterfly it may not be since when they fail the accelerator greetings

Can it be a ignition or module coil problem? I say it for the explosions that you say it gives to decelerate. The butterfly body, I don't think anything has to be programmed (the ECU recognizes only the min and max stops. At least I have seen that in WV)

1st. Check that you do not have vacuum jalones in the admission and program the acceleration body of not correcting changes the acceleration body.