hi all, my engine has developed a slight miss only when accelerating and only when hot ( well normal running temp), would/could this be the leads do u think?, it's d'fuel and only use 95-98ron unleaded, its always serviced on time and looked after, plugs seem ok, ive tried some injector cleaner, new fuel pump, any ideas???

Is it missing on both fuels? or only on LPG?

LPG is more sensitive to spark issues, and I would suggest that if you have not replaced the leads and plugs for some time, then that is a good place to start.

Cheers
BenJ

could even be the dreaded inlet manifold gasket?

when hot and only under power.. first thing that springs to mind is the coil.

here's a test, get it nice and hot, then park it with the engine running and give the coil hit with some water. If it creates a misfire, then the coil stuffed.