Hey family. I just bought this grand national (dream car) from a young guy, who I dont know what direction he was headed. Ok when I went to look at the car it had been sitting for a couple of years and the battery WAS dead. After a boost the car started up and ran rough and top of oil feed tube was leaking oil and it dripped on the pipes but no snoke out the tailpipes even after giving it some gas. He told me he'll fix it by the next time I came back over. Went back and he fixed the oil feed problem but now the car smokes out the tailpipes when starting but stops soon afterwards but give it a little gas and smokes comes out again. What can be causing this weird problem