KitchenAid Dishwasher runs intermittently but doesn’t clean

Have you checked the filter inside the unit? Page 16 and 17.

Also can you post a photo of your drain tube? The drain tube needs sufficient fall to prevent dirty water from backfilling the unit.

The motor could still be faulty for a couple reasons.

I'll explain:

The short answer is that the all the moving parts of the main pump motor are under water and the magnetic armature shaft is held in place by two graphite bushings.

Yeah, the bushings are made of pencil lead. You're getting graphite dust in your rinse water.

These wear out and the magnetic impeller shaft starts wobbling. Wobbling makes the bushing wear out even faster.

Eventually the shaft just sticks to the side and the motor shuts down.

Another problem could be that the replacement motor is the wrong one but it still fits the dishwasher. They are larger than the original and put too much of an electrical load on the circuit board.

Yep , your dishwasher is quiet partly due to having a weak energy star motor... when it works... I don't see how running for 3 hours is saving energy when it could prolly wash it all clean in 20min with a powerful motor.

Just a bad design and they gouge you with poorly made replacements.