ok so :
-I said lexus GB as the whole outside is rebadged to Lexus, the service book is present and has full lexus service history, the paperwork says gs300 sport too. vin etc match... could have been a good conversion then I guess....
-The EML comes on when you switch the ignition but comes off once you start the car so there is no actual fault.
-sounds scary with the head gasket but I would see mayo in the oil aswell? the oil looked fresh... the car would overheat aswell... havent seen any of these symptoms (buty does make sense why the EML is not lit...) Think I have 1 more thing to check for that... open radiator cap to see if any bubbles come up on idle
-pin wise... erm think it's the top of the plug... 2 connections which are close to eachother (not sure which ones as I've done it a few weeks ago and havent returned to it yet) does anyone have a proper procedure for this?
-I think I'm still right about the vertex edition as it has the badge on the side, it's pearl white... has the JBL sound system, touchscreen, folding mirrors, electric steering column and other wacky toys :)
To me it feels spark related and I was thinking its the spark plugs or the coil itself... but cant diagnose it that easy due to this old school diagnostic method (I have proper full on BMW diagnostic which shows things like this to me in a few secs, but was never to good with anything below odb2 ;/ )