PEUGEOT 406 TX HDI Mod.2004 without strength in walking

I have a Peugeot 406 TX HDI Model 2004, which suffered the cut of the distribution strap. He took it to the mechanic and the only thing that broke was a rocker, which changed. The engine ignites well, only that walking is a disaster. It has no strength, to go first you have to stretch forcing it a lot in turns. We connect a computer and it gives us that all values ​​are fine. I don't know how to check or control. Can someone help me ?? Thank you.

I tell you, the camshafts of these vehicles are not solid, but the cams are put to pressure and it is common that when you start distribution strap these cams moves their position in the camshaft itself, it will not give you failure in diagnosis but logically the engine does not go,

If you do a compression test you may sing it

Check out the tuning and that do not rule loose air connections. And if it is true, it measures a comprehension, some valve may be folded.

Are you sure it's okay?