The first test which gives plenty of information is to pedal to get the rear wheel spinning in the air, then stop pedaling and let it coast. Watch the top of the chain to see if the top loop sags, or if the spinning wheel pushes the pedals around. A gentle pushing is fairly common, but a sagging top loop or positive pushing force means the freehub is sticking.
OTOH- stiff backpedaling, not coming from the BB, and no freewheel resistance, means the source of friction is in the lower loop, usually within the chain itself from poor or dried lube, or rust, or sticky RD pulleys.
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Last edited by FBinNY; 03-16-16 at 10:36 PM.