Hi
For the hunting, the Idle Control Valve would be my first port of call. It may well need a good clean out, and doing so can work wonders!
As Chris says, the flywheel sensor is another possible culprit - often the ends of these just need a good clean as well, if you take it off and look it can be covered in muck.
As for the central locking, assuming you have checked the fuse is OK, it is probably the switch inside the driver's door.
David
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