Banned for not
following the site
Join Date: Feb 2008
Location: United Kingdom
What milage is the car and has it had the cambelt done?
Have you checked the water level now it's been sat a while?
Now that I've read this thread I fear that you've droped a valve, very rare and normally caused by overheating, I believe that your waterpump theory would be the best one to run with, but unfortunately if a Valve has droped, then there is no saving that engine as it will probably desroyed the relevant piston and bore as well as mangling the head and plug, so just start by removing the plugs and inspecting them, they can save a lot of time in diagnosing that way.
Failing that it is possible that this is just a MAF problem and it's lieing so badly that it's cuting the fuel right off at higher revs, leaning the engine off and cooking it that way, try starting it up with the MAF unpluged, it may be that simple.