boxer engine - dodginess when warm/hot
When the 33 (1.7 16v) gets warmer than usual, e.g. in slow moving traffic, sometimes when you try to accelerate it won't 'go' properly and is accompanied with a strange sort of knocking noise. Once it gets a little bit cooler the noise disappears and performance is restored.
I have some new oil ready to go in in case it's getting too thin at high temperatures, but suspect that won't solve it because the oil that's in (fully-synth) has only done 3000 easy miles.
One other thing I want to try is cleaning out the crankcase breather system, but what does that entail? (in laymans terms please!). I asked the garage to do this last service, but forgot to check whether they remembered or not.
Or, any other ideas?