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[trinity0_10]

I have just returned from 5 weeks abroad, [ had a Holden Commadore Omega SV6 as a hire car,   , why haven't we got these cars here?]  

Back to the question, running ours again it has a slight & annoying vibration at idle, it's the same on gas & petrol so I am thinking it's either a valve sticking or electrical.
Does a misfire cause the V6 to lump? is it pronounced? Also has anybody experienced a sticking valve?
It  still accelerates ok but fuel economy is down so something is amiss. I was looking for ideas before I jump in, probably first will be spark plugs & work back. Is there an additive if it's a sticking valve which works? heads off is a last resort at present. It's too bloody cold.

[Marks DTM Calib]

NEVER seen a stciking valev so that is very unlikely.....

Start with the ignition system checking for oil in the plug wells and examine the state of the leads.

[trinity0_10]

Hi, Thanks, forgot to say I had the leads off the plugs & sprayed WD40 just in case of damp. No oil in plug wells apart from middle drivers side. there is a little about 1 mm deep. Would a misfire cause the engine  to lump. I could try pulling all leads in turn to see if theres a difference? & look in the dark to check on tracking.