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Are you saying that max possible revs have dropped from 5500 to 1500 over a period of time?

I don't know the 900 in detail so you may want to take any thoughts with a pinch of salt

I had a Mini that had similar symptoms, the air filter collapsed and blocked the inlet. Been though any deep water lately?

Knock sensor dead.

Throttle cable frayed and not opening throttle (had this on another car too).

Fuel pump pressure/ filter.
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