Will a bad computer make my Cruiser run rough? on 2001 Chrysler PT Cruiser

Took my cruiser to be repaird, car switches off while driving or sitting still and jerks. I have never had a check engine light to come on. The mechanic states that the computer is bad in the car and it's what's causing my car to run the way it is. Can anyone tell me if this is true?

Asked by for the 2001 Chrysler PT Cruiser
we cannot see the car so it is hard for us to say. the odds of the computer being bad are very slim. if the check engine works with the key on, then it is doing something. the issue may be basic engine, not fuel control.

i would get a second opinion before spending this kind of money.