Spark Plugs

[ulfilias]

I've got a fault with my A8 D3 4.2 and the LPG conversion. Runs fine on petrol, throws a missfire on Cylinder 8 on LPG!!!

I know LPG is finnicky and tends to show up failing issues which are ok on petrol!

Asumming that Cyclinder 8 is passenger side back, from what i've so far found out. I swapped coil pack 8 and 6. (still Cylinder 8) and spark plug 5 & 8 (still cylinder 8). So I'm comming down to the LPG system and it's wiring!

However the plugs in the car are Denso K20TT and since i'm not sure when they were last changed i'm tempted, but I don't think these are the OEM ones, though they appear both cheap and pretty good???

Lee