New 2 me car w/ small issues

I'm new to PA's, and this car I just got has a few issues.

The radio ate tapes so I installed another OEM unit and it all works but the AM band does not have good sound..... (didn't before either) it is weak and scratchy... like a bad antenna.... FM works great. Any ideas as to what could be going on? what is the routing for the antenna? Where is the antenna?

I need new shocks all around. What do you folks recommend?

The low tire pressure message is on. I have 36 in the front and 34 in the rear, and it is still on. What makes it go off? What tire pressure do you recommend? OK I found the button for this.

Is there a adobie version of the owners manual available?

What about a Maintenance & Repair CD?

Thanks,
BPA

I cant have the only PA that is having problems with the AM radio..... I'm not that lucky.... LOL

Ok I'm sure everyone here already knows this but me..... LOL
However in the event someone else doesn't know where to get free downloadable pdf BPA owners manuals here is the link.....

http://www.extendedgmwarranty.com/owners-manual/buick_owner_manuals.html

Regards,
BPA