1999 Mazda Eunos Hot starting / running problems.

This has been going on for a little while, and I have some ideas, but would like a second opinion.

*Car doesn't want to start when hot
- turns over strongly, but doesn't catch
- if it does catch and hesitantly start, it will run fine
- no hesitation on load when accelerating
- after about 30 minutes, the car will start again and run well
*Car has twice cut out when hot when coming to a stop - the revs simply drop off.
- no symptoms before this happens
*At MOT the emission readings were high and JUST passed
*Fuel economy isn't as great as it could be (but not horrendous, just worse than some other's of the same spec)

I have checked the thermostat, which functions correctly, as does the electric fan, the radiator was changed last week and is functioning perfectly - so it is not an overheating issue.

I removed the Cam Angle Sensor, cleaned and re-installed. I have yet to do the same with the Crank Position Sensor.

As there is no misfire, or hesitation, I doubt it is the ignition module or leads. I have visually inspected them and they seem fine.

My three suspect parts are: Cam Angle Sensor failing, Crank Position Sensor failing or engine block temperature sender failed / failing and reporting back to the ECU that the engine is cold always.


What do you think?