1998 E300TD runs at about 75% power. After I turn it off, let it rest for 5-10 minutes it runs terribly. Idles fine but has very limited power and misfires badly when driving. It displayed a MAF sensor code, replaced sensor and the situation did not improve.

I checked for vacuum leaks using starting fluid and noted that the metal tube that connects to the rear of EGR from the exhaust manifold is firmly in place, but the idle did change when sprayed with starting fluid.

Just completed a lot of work to vehicle:
Removed and had head rebuilt by machine shop.
New glow plugs.
Fuel Injectors rebuilt
MAF sensor replaced with Bosch unit from PeachParts.
Replaced vacuum lines from EGR to control unit

Vehicle ran well before, head had to be removed because of the glow plugs.

Appreciate any and all advice.