Is the mechanic right or is he wrong?

Had to put a engine in my ford another 4.6 I had to change the throttle body all 4 O2 sensors MAF sensor EGR valve and the injectors. I think my catalytic converters are clogged cause I lost all power driving it and my valves rattle too could that be it or is the mechanic right on me needing a engine due to the " so called EGR valve" being stuck open and burning my cylinders up? Need to know!

Ask a different mechanic about your car before you commit any dollars any which way. EGR valve being open would give you less power. Hey it is your money. It is your decision to actually have someone else evaluate it. My friend gets 5 quotes before doing anything on anything.

You need to type in: function: EGR valve You will find that a CLOSED EGR valve OVERHEATS ENGINE PARTS.

Have you ever asked yourself WHY Ford discontinued the 4.6?