Your problem may be that it is a SAAB and that is not a joke.

These cars were prone to a failure of the neutral safety switch. Do a bit of Google work on this and you will see all sorts of ways to easily test for this condition.

And if that's the problem there are also ways to wire around it. A new switch is over $500 and they are tough to install.

Used ones are normally available on Ebay for around $100. They can also be rebuilt but this is quite tricky and very easy to mess up.

But there are instructions on SAAB forums on how this can be done.