Check all tyres, seals, belts and hoses, being rubber they may have dried out over time and have gone brittle, none of these will be cheap to repair. Check underneath for signs that wildlife have chosen it as a new home, cars are very much liked by rodents.
edit: check tyre pressures and for flat spots too
edit edit: check brake lines too, they're rubber Fuel in the tank will be rubbish too, so you'll need to sort that out, supposedly high octane fuel starts to go horrible within 6 months or so.