Update. Had a spare map sensor so braved the storm outside and changed it over.
Took the car for a 15 mile drive and left it to idle for a while to. Made sure it was warmed upm
So far it has solved the problem no dipping in revs when braking hard and idle ticking over fine.
Will update in a couple of days once I have used it more goin to work and back and see if it comes bck.
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