I'd pull the coupler off again and make sure that the prongs and holes line up correctly. If they weren't aligned when you replaced the coupler, they could be sliding on and rubbing the rubber connector down.
I'd also make sure that the plugs for the motor are correctly in place.
Following is the Whirlpool Service Manual for these machines. It doesn't have a "troubleshooting" answer for a burning smell but you might be better able to diagnose the smell by looking at how the motor connections fit.
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