I have an 1982 JD 116 Lawn Tractor (with a Briggs) that has been a great running mower for the last 8 years but it developed a not so pleasant cough this past weekend. The engine began to serge and sputter then eventually quit. It sounds like it was starved for fuel. I change the the oil regularly along with the air filter and fuel filter. I tore into it Saturday got it running again but when I ingauged pto it quit again. I found a crack in one of the fuel lines and replaced it and it is still not right. I start it and it runs then dies. The other thing I should note is I think the engine is pretty tired because once I turn it off it won't start hot. Any advice would be appreciated. I know it's at the end of its days but I was hoping to get one more season out of it. Thank in advance for any replies.