engine runs like in limp mode and rattles like timing chain is loose

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I'm sorry to hear you're having trouble with your vehicle. The symptoms you're describing for your Edge suggest some potentially serious underlying issues. The filthy oil and sludge indicate that the engine may have had poor maintenance before your purchase, which can lead to clogged oil passages, oil starvation, and damage to engine components. Since the cam sensor was changed and the position port was clogged with sludge, it's likely that there could be damage to the camshaft actuator. A clogged oil system can also cause other engine performance issues, leading to limp mode. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!