I have a Year 2000 v6 Commodore

Recenly... When i start the car in the morning there is a clicking noise a bit like a spark plug is arking
the click is not precisily steady..
...but when i rev the motor the clicking does not increase in speed.As the car warns up the clicking disappears.

Could it be a coil or something...

Any ideas and a remedy !????

Bit worried it may be something more sinister ???????

OldBob