can a computer be tested?

[BuickNick]

I'm having a couple issues with my car, and I'm starting to suspect the brain as a possible problem. I remember seeing something about dealers being able to test the computer. Can they? and how good is their testing if they do?
I'd hate to spend $110 on a new one to see if it fixes things.
thanks,
nick

 

[final5-0]

Hey Nick

Do you have a bud with the same kind of Stang?

If so, swap out the pcm's for a few days or weeks

Grady