Comp tested fairly even across cyl 3 down slightly. It's Not the turbo. Nothing like oils in cooler ( runs top mount) or exhaust. Could it be valve stems ? Sticking valve or am I way off ?
Dose not do it from cold on tickover even if it's stood.
Anything to check or advice would be great.i ain't stupid can do most things but
Internals of engine and box are not my strongest point leave them to people with more knowhow and skills