1990 Camry, 4 cyl. 2.0

Intermittent electrical in the fuel pump circuit somewhere. Those other codes were probably red herrings; the on-board computer mis-diagnosing the problem. Have your mechanic hard-wire the fuel pump so it's always on when the key is on. If that works as a temporary fix, you can either leave it that way or get out the microscope and start taking the car apart to find the loose wire, cracked solder joint, corroded connection, etc.

the two parts he replaced were faulty. when he removed the MAF sesnor, the car idled like normal. When he put the new one on, code cleared. Same with TPS.

uh-huh. and your car is still experiencing the original fault, is it not?

Hard starting when the engine is cold but not when the engine has warmed up, with no other drivability issues is generally a symptom of a problem with the cold start enrichment system. Besides the cold start injector, there is a coolant temperature sender (I don't remember offhand whether your car has separate senders for the instrument gauge and one for the cold start circuit or if one sender serves both purposes). In some engines, there is a cold start injector timer and in others, the function is handled by the car's electronic control unit (ECU). A repair manual will tell whether there is one or two senders, and if there is a timer. The technician should check to see if the cold start injector is being energized while the engine is cranking, and if it is not, check the coolant temperature sender circuit and timer circuit, if there is one.

the reason why I took the car in is because the damn thing wouldn't stay on for longer than 5 mins. Kinda made driving to work a little hard.

He changed out the ECTsensor and it seems to be doiing fine. he is going to double check readings on everything. he did said the injector itself was working properly, which I took to mean it wasn't dirty or cracked....sooo...here's to hoping and I'll post when I get her back this week.

I get the impression that whoever is working on your car is just swapping parts in hopes of fixing the problem. a competent technician will check parts and associated wiring before condemning them.