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you would really need to confirm whether a valve has burnt out ! if a valve cant seat properly or quickly enough they will burn out very quickly indeed.
a cylinder leakage test using compressed air is the quick method of confirming if a valve has burnt out. If a valve is burnt out then its too late for the water trick..
Sticky valves or incorrect oil grades can cause lifters to hold the valves of there seats although if the cars left standing the lifters do retract on their own. so on each initiall start up I would expect it to start up without a misfire. I wouldnt of expected in this day and age for an inlet or exhaust valve to of totally stuck in the guide. There is a lot of design that goes inot the base circle of the cam lobe which should allow the lifters to work exactly as they should and relief valves in the head to reduce excess pressure but its not an exact science.
I used to repair fleets of Vauxhall cars in there hundereds and did experince considereable amount of burnt out valves and cracked valve seats and numerous cracked heads.
The water trick needs a fine mist of water being drawn into the inlet manifold with the engine running for some hours. Consideration has to be given too the design of the inlet manifold , if it has deep chambers water could build up and you could hydraulic the engine if you were to rev it up and draw water in so this all has to be considered.
A large water resovoir with a small vacum pipe going to the inlet manifold will work but you must use a fish tank clamp to compress pipe almost flat to ensure a very small amount of water is drawn up the pipe. Driving on very light throttle helps draw the water up , to give you an idea some very bad cars that were almost undriveable would take several gallons of water and a motorway crusie at about 50-60 for 200 miles used to work a treat.
Its a bit like when a headgasket goes and water gets in the cylinder and you find its all washed clean and the carbons gone.
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