Hi all, I've googled the world for this with no joy.... Hope someone here's experienced this & is in 'the know'... 2004 VYII 300k's (I've had it since 140k's) standard motor (ex Pol car, factory LPG), auto, only change I've made is from vaporized LPG to injected LPG. Coils are less than 20K old Plugs & leads less than 40K old (platinum iridium plugs) No check engine warnings The problem happens on both LPG & petrol. When the engine is hot (normal operating temp, never when cold) sitting in park/nuteral or drive. At totally random times the rpm will suddenly drop, then recover. Only once has it ever dropped enough to make it stall (in drive, stationary stuck in traffic). I've checked for vacuum leaks, nothing heard/seen. I'm out of ideas (fyi, I'm not a complete newb, I did my apprenticeship in the early 90's just been off the tools since 00).