My 1988 honda won't not stay on when i start it

Question

when i crank it up it runs for abt 2 seconds then cuts off, and when i start is i have to hold the key and it keeps on running but after i let it go it runs also when i hold the key i put the AC on and then after abt 10 seconds the car would run...and someone told me it was the altenator but idk

Answer 1

Head gasket or vac. lines could be cracked. If your car has ever overheated then I would say your head gasket for sure.