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2004 Auto? Those were a bit problematic when they first came out. It could be a carbon build up issue which has lowered the compression which means the engine could be going.
FORTUNATELY the rotary engine is warrantied for 8 years / 100,000 MILES so have your brother call the dealership and tell them he has "severe lack of power" (those are the key words) and they'll get him in for diagnostic
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