Dad has moved to assisted living and left me to deal with his baby (79 280ZX black w/gold trim, 54,000, yes 54,000 miles) never been housed outside, always had a cover inside) I am trying to sell it and have found a good, local, potential buyer ($27,000). He is coming by this weekend to take it for a test drive. I am going to replace the battery....it has been sitting for years without regular driving, battery is weak. I also need to add gas to it. I don't know anything about it other than it should take leaded gas! What do I add to the unleaded gas to make it run better. I was told there was an additive that can be added. Please help! I know nothing about cars.
Chickenlady