307 automatic

hello guys i have a problem like this In normal situations, 307 automatic vehicles should go at 3000 with the speed of 110 km in 4th gear. but my car started to go at 90 in 4th gear. the car does not react when I press the accelerator pedal, i.e. the gas hand rises, but I cannot receive a response from the transmission. I wonder what the reasons may be or have anyone happened before? Thank you in advance

Does it do this all the time or does it after doing a long road and also the car doesn't over 90?

he does it all the time. It exceeds 90 but the car screams a lot. It needs to go up to 4000 revolutions in order to accelerate to 100 km. Last year, he was doing it only on the long road, stopping and stopping and turning the ignition on and off, the first 20 minutes were going normally, but later it was deteriorating now, he always does it.

by the way, the sword does not fail

The transmission can be from the brain. To show the most robust to a gearbox as soon as possible before larger troubles begin. Similar incident happened to me, the complete transmission was overhauled again, the brain did not improve again.

low oil pressure, leakage in the brain, installation of the filter in the transmission, etc. As friends say, it is better to have a master as soon as possible.

thank you guys but the owner of the car before me has revised, I changed it in the brain but good luck let's leave the car on Monday Monday