But there was NO as is clause in the bill of sale.
There is no need for an "as-is" clause unless expressly required by your State's laws.
Why would you expect a 12 year old PONTIAC to not have issues? They are NOTORIOUS for issues which you could have pulled up with a simple Google search. From one owner's review:
Dislike-
Vibra-shaft- Code named for driveshafts from 1993-1997 Trans-Am/Firebird's with the WS9-Y87 tag.
7.5 10 Bolt Rear ends - garbage, weak structure, barely holds stock power. Some cases will hold the 300 whp the car lays down, some cases not.
Stock Clutch- hit or miss, known to last short periods of time due to its poor construction. anything over 400 whp i recoommend a clutch upgragde.
not a fan of the dashboard either.
Mullet and redneck jokes... galore..
So, let's recap your "issues" you want to sue the guy for.
engine - hmmm... a sports car with engine issues? Never...
clutch - Wear item.
brake disks - Wear item.
shoes - Wear item.
tie rod ends - Wear item.
engine ignition - Wear item.
wires - Wear item.
So, you have had 7 issues with a 12 year old car... 6 of them are common "wear items" designed to need periodic replacement, the seventh could have any number of causes from lack of maintenance on your part, lack of maintenance on his part, excessively high mileage, driving it like a hot rod, or possibly being a "Katrina Kar".
YOU HAVE NO CASE, AS-IS ON THE PAPERS OR NOT.