[Hozer 88GTConv]

I'd get an EGR simulator plug from ebay. Some guy in Colorado sells them. All it is is a male plug that fits into the egr plunger harness and sends a 2.2vdc signal. That will eliminate the egr code.

The MAF code means you need to check the signal wire from the MAF itself AFTER you clean the element with evaporating electronic parts cleaner.
If a cleaning doesn't work, then check the signal voltage on the appropriate wire (Tan/Light Blue wire 18 gauge is the signal return, dark blue/orange is the signal wire)
Or go to a junkyard and get a MAF sensor from any FORD from the right period, I paid $5 for a couple of 'em. (at the parts store new, they were $200!!)

A bad VSS will hurt your drivability off of the gas, as the car returns to idle off the gas it may hang up or hunt/surge...take the sensor off and check voltages or swap (they are cheap!)

good luck...