Fluctuating / bad idle

[David]

Hello all. I think we have found the Problem. My mechanic did a pressure test at the inlet and outlet valve. Everything was fine. Then he looked at the timingchains. One timing chain is loose. The other is tight. it looks like she's skipped a tooth.
Now i order new complete timing Set.

You might like to read this old thread. This may have contributed to/explained the death of the engine in #347?
https://www.two-sixties.co.uk/mgoc26...-chain-tension

P.S. If you do replace the chains, chain guides and tensioners, I would be interested in knowing if it was possible to do it with the engine in-situ. Mine is passed its scheduled change date.

David