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Because you have ruined it.
:-)Could be lots of other things. Whilst it's true that only those three things should affect fueling (are you sure - are there not ambient or intake air temperature sensors too?) because those are the things which are designed to deliver variable outputs, that logic relies upon the rest of the system working.
failing fuel pump?
clogged injectors?
air leak or blockage? (do you have an idle air hose? do you have an oil overflow that goes back into the intake?)
vacuum issues?
faulty wiring - how hot does it get under there?
dizzy cap / HT leads / plugs / rotor arm / plug coils (delete as appropriate)
some silly electrical thing like a fuel pump relay an ECU, a valve.
bq
@Dammit
Right, why is my fucking car stalling in traffic?
Matt reckons it's flooding - only three things can affect fuelling, coolant temp sensor (gauge stays rock steady) MAF (changed that today) and Lambda sensor (WTF would that overheat in traffic when it didn't whilst I was going round Castle Combe?)
I am at a loss.