Elia! I've had the same thing happen to just days ago. My opinion is that the engine was damaged by the heat (piston rings, pistons and cylinder) I might be wrong though.

Have you had a compression test on the engine.

I will be getting mine checked any day now.

It is possible that the intake might need overhaul (see intake overhaul in the how to section)

Hope this helps

Regards

Both in April Ford Countour SE
5MTX 1996/27kilo.
I intend to by a set of MSDS headers with some good low rumbling tone like at South County Motor. I having the upper intake extruded &honed. Change TB with SVT.
By a Pro-Flow 75 maf. Diablo chip on Top. IF and only if I'm happy with the results. A Quaifle T/b diff. IF my Girlfriend can still stand my driving (she does not drive) a New Radiator (the one that pushes 11 PSI into the intake manifold) I think that this engine would be proud to put 300hp on the asphalt.