I've just received my latest Classics World mag, and I see that you are about to embark on a Morris Marina project. I'm hopefully coming towards the end of recommissioning my Mk2 1.8 estate. Although I've not yet read the article, I did notice that you commented on a partthrottle issue, causing slight ‘lumpiness.’ I've had a similar issue, which I've yet to resolve. I've replaced the entire ignition system, checked the timing and tappets, cleaned out the carburettor and petrol tank, replaced the fuel line, as well as checking the mechanical fuel pump output. In spite of this, I still have the issue. It's more of an irritation than a big problem. I'm wondering whether it's a slightly sticking engine valve, so I've put some upper cylinder lubricant in…