Pathfinder year 2000 makes giant rattle

My Pathfinder year 2000, automatic gasoline, suddenly in a vehicular tranque, was slow and the resolutions were lowered. The car stopped completely and the mechanic did something and lit, he told me to take him quickly to his workshop, and that when he was slow for the traffic, he put it in neutral and stepped on the accelerator, I did so all the way, although sometimes he stopped. When we were on the road, I did the neutral but the car did not stop, the brake became hard and had to stop it with the brake lever, then re -lock him up and thus continue until I reached my house to take it the next day to the workshop because that day he could not serve him ... the next day I turned it on and after 2 minutes he went out, I turned to turn it on and left quickly and left the parking lot. Accelerating to the workshop, but arriving at the mechanic's workshop, he went out again and put it in neutral as he told me (he was sitting to my side) but again he kept moving forward and he told me to take him like that but wanting to stop, nothing, he did not stop again, and felt the super hard brake and he told me that it was that I did not step on it with more force, he said again, Brake lever And so he stopped. We arrived at the workshop, he checked it, and changed the spark plugs, the gasoline filter, etc ... and when the car was started as a giant rattle, it did not turn on and it was a horrible noise like metals crashing super ugly. And since that day, they took it in crane for another workshop and nobody has found what the car has ...

VALGE ME !! But if you hear from here !! ... jokes apart, that the brake goes hard I think the servo can be drilled, the noise and that it goes out, it might have skipped the distribution strap and everything has been outdated, and that is why it is difficult for him to start and stay behind, but of course, if he has the belt badly and have been starting it and stopped Coto-clon .. Coto-clonc and is already hitting the piston to the valve and is ugly, if it is. MIA COLCLUSION: To check the distribution strap and its tensioner, and if it has gone, to raise a butt to see that any valve has not been bent. I hope to be wrong and not this, what has passed us, you will tell us, good luck !!