Hi all
Im after some help my uncles astra has developed a fault.
When you go out it runs fine for about 4miles then the engine light comes on and the rev counter stops working. He pulls up and the engine sound like it going to stall the the revs pick up and it just carrys on like this.

Also i took the pump of the end of the cam and it was full of oil should this be the case thanks for your help.