I have this problem as well, car only making knocking turning right whilst in gear. Mine is caused by the rear silencer mount being snapped off the exhaust. It can be fixed by re-welding or replacing exhaust.
Don't know if yours is caused by the same but if you let the car idle then reach under the car from the drivers side and push the exhaust over. If this causes it to rumble it could be the exhaust.
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