4.0 SOHV 98 Explorer Wont Run with Mass Air Flow Connected

[Docjim1954]

I'm looking for some help. I've got a 1998 Ford Explorer Chassis which has a 49 Chevy panel body on top of it. Everything is Ford except the body. We have got the vehicle to run by replacing a number of things, Fuel pump, fuel filter, crankshaft sensor, heat sensors and mass air flow sensor. We also replaced the upper and lower intake manifold gaskets and cleaned everything up. Tested throttle assembly sensor, camshaft sensor, etc, etc. etc. The issue is that when we plug in the mass air flow sensor she dies right out. Both the old and the new Mass Air Flow sensors bench tested fine but we opted to replace it anyway.

We also replaced the ECM so I'm really stumped and could use some suggestions.

Thanks in advance
Jim