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From what you have described here this sounds like a loss of fuel.I have seen a restricted fuel filter cause this issue as well as a weak failing fuel pump/injection pump cause this fault here.If you have not replaced the fuel filter recently I would have this done to see if this resolves the issue.If this is o.k. I would have the fuel system tested to see if the pump is failing to need to be replaced.
If the fuel system is found to be o.k. the other cause can be a fault with an exhaust component being restricted like a catalytic converter or resonator.This will cause lack of power uphill or at higher speeds.I would have the exhaust back pressure tested to see if it is excessive with an exhaust component needing replaced.
These are the common causes for this type of fault here needing checked into and repaired.
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