UK Car Repair Questions? Ask a Mechanic for Answers ASAP
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If the throttle body has carbon build up in it the throttle body will need cleaned and can cause this fault here.The other issues I have seen cause this issue here is a fault with a vacuum leak on the engine itself with excess air entering the engine past a gasket like the intake gaskets leaking or a fault with a vacuum hose leaking.
This will cause a poor idle condition as well.If vacuum leaks have not been checked for this needs done and if a leak is found it will need repaired to correct this fault here.
These need checked into further to locate and repair the fault here.
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Did the idle issue only occur after the throttle body was replaced and did the electronics come on the throttle body?
What can cause this issue here is a fault with the idle speed speed control actuator itself.If this issue only occurred after the throttle body was replaced and wasn't an issue until. It was replaced I suspect you installed a throttle body with a faulty idle speed actuator.
I don't see a specific idle relearn on this model here so this shouldn't be the cause here.
I don't see a relay or fuse in line that would cause this without causing any other issues as well.