[rogerthechorister]

Well the “new” coil and ECU have not gone in yet, and there was no bad running until last week when I had nasty symptoms - first ok at tick over and until there was boost, but coming close to dying when boost showed. Then coming close to dying altogether unless I closed the throttle and opened it not too hard. Struggled to get 10 miles home.

So I took all the intake hoses off - and lo! and behold! the bolts that hold the dump valve together were close to falling out, there was a quarter inch gap where the gasket should be and some straggly remnants of gasket were flapping about. I didn’t have the right gasket to hand so there was some desultory cleaning and then a very old tube of Instant Gasket was pressed into service - since when she has run perfectly, although still producing the slightly bumbly tick over that she has always had.

Now I have to wait for a REALLY hot day to see if the first fault mentioned on this thread is fixed.