Iveco Eurocargo Tector Engine Problem

Have a problem with my lorry at the moment. Last week it burst a frost plug at the back of engine, letting water into engine oil so gearbox, bell housing, injector pump etc had to be stripped off to get it sorted, A complete nightmare to fix a little £2 piece of tin lol. That problem’s been sorted now, everything’s been put back in place but now there’s a new problem. The lorry drives perfect for maybe 20 mins or so until it’s up to running temperature then it come’s off a cylinder, not fully, maybe half off. When the lorry is cold, it runs normal again until it’s up to running temperature then same thing happens.
Any Ideas?

That plug may well not have randomly just decided to blow there could be something more fundamental wrong that caused it.

Own Account Driver:
That plug may well not have randomly just decided to blow there could be something more fundamental wrong that caused it.

On early LFs they used to just corrode lol…Possibly an injector breaking down when hot

The back of it was badly corroded. You’d think they’d just put brass ones in the really awkward places lol.