I need some help with my car

I have a 1996 grand am gt 4 door ive been through hell trying to figure this pos out..
to the point.
New EGR
New Fuel Filter
New Oil Filter
New Sparks
& wires
New oil
An nothing gives
Hot Weather kill my car unless im on the interstate doing 70 than it never dies
25 minits of stop light traffic an my car dies bc it gits hot but the meter is not over half way
Now Im stuck with aether the fuel pump???
Or the mass air flow sensor
had ^^ that code come up but it eventually went away an im code free
i don't know what to replace
ppl at these auto part stores these day's are idiots an i have no where else to turn:runaround:

What is half way for you? Give us numbers!

Have you ever considered that it could be a temperature sensor somewhere? like the IAT? (intake Ait Temperature)

Also, Are your radiator fans working? On highway the airflow is probably high enought that the fan are not mandatory to cool the radiator enought.

-is it 3.1 or 2.4l?
give us pcm codes in Pxxxx format.
-what happens when engine dies, does it restart or it takes a while?

maf sensor will not make your engine die, you can try this by disconnecting the maf. Pcm will take over and will use basic maps which will not be very accurate but you will still be able to drive.