Sounds Like You Have A Blown Head Gasket 1)Injectors need proressional cleaning. 2)Throttle body dirty & positioning sensor out of adjustment or blown. 3)Computer messing up. 4)plugs are fouled out not firing Burning gas right 5)timing is off ( try timing first) 6) Air filter pluged not getting enough air to burn right Change pcv valve too. 7)if carberated clean carb & change plugs & ajust timing Happy new year and good luck. If the head gasket was blown it would overheat quick.