Mg zr 1.8t idle problems

I've got a ZR with the 1.8 k-series turbo fitted and whenever I get in the car and start it up the revs will idle up and down and sometimes even stall, but if I then turn the ignition off and then restart the car it will idle fine then. Has anyone heard of anything like this before? I've replaced the idle control valve and cleaned the map sensor in the inlet manifold. Not sure what else I could do.

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