Hello, I currently drive a 2001 Mercury Sable 3.0 DOHC V6 with 235k miles. I recently fixed vacuum leaks and misfires (cylinder 5) on the car and the engine idles rough when started cold and makes loud noises (rumbling under car) when driving around 35-45 mph. I have checked IAC and EGR valves but I’m not sure if I did the right tests. Anyone with a similar engine/problem who can help me?
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