A car like this that has been sitting needs to have multiple things checked and done to it. The battery was the first thing but there is still tons more
-Gas in the tank. You should also drop the tank and have it cleaned. If the tank had gas sitting in it for all these years there is now a bunch of rust and debris that are going to clog the fuel lines and injectors
-Check to make sure the car is getting fuel. Check the fuel pump, change the fuel filter, and pull each injector to make sure that fuel will flow from each check point. Tank-to pump-to filter- fuel rail-injectors
-spark plug wires and spark plugs. If the wires are trashed or the plugs used up the car will not want to crank, or if it does not run properly. Plugs and wires are cheap, get a new set of all. You also need to do the cap and rotor, again cheap
-Replace the air filter
-check the starter, alternator, coil, battery cables, battery connections, ground wires, and pretty much any wires you see for corrosion or breakage. While your at it also check all vaccum hoses for similar
Aside from dropping the gas tank all of this is easy, cheap, and quick to do and should give you a good basis of the cars condition; as well as where you need to go next.
Some other things you might want to check out too are the MAF and ECU to make sure they aren't fried or corroded. Not to mention the TPS
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