Only revving to 2000 after spark plug change...help!

Hi, having just changed the spark plugs (new ones are the same make and spec) on my Micra 1.2 K13 and now it only revs up to 2000 revs, any ideas?
 
Ah...resolved! The throttle body connector was disconnected. Also, I had to disconnect & reconnect the battery cable, to clear the engine management yellow light, then enter the radio PIN code. All resolved now.
 
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