ECM fuse blows

I have a 1993 Gran Am Quad 4. After I drive for awhile the car shuts down. I found it to be the ECM fuse blew, I replaced it and it runs fine until the fuse blow again.
Anyone knows what the problem is when the ECM fuse blows.
My thought would be the ECM is bad or going bad.
How can I trouble shoot this?

ECM= Electrical Control Module. (I don't like Acronyms)

You will need a wiring diagram for the circuit that that fuse powers and start looking for a pinched harness or overloaded circuit.

Where can I get a wiring diagram for this vehicle?
The Haynes manual doesn't help me.

You will need a wiring diagram for the circuit that that fuse powers and start looking for a pinched harness or overloaded circuit.
The car would run and sometimes blow the fuse, until one day it kept blowing it. I tryed different things nothing worked.
One day the engine ran long enough (before blowing the fuse) that I moved different sections of wires until the fuse blow. I put in another fuse and moved the same wires again and saw a spark.

You were correct, some wires were rubbing on the transmission. This worn through the wire insulation causing them to short out blowing the fuse. I taped them up and moved them away from the trans and all is well. Thank you.