Ive noticed lately that whenever I give my car a considerable amount of gas, and rev between 2800 and 3500 rpms, there is a noise sounds like a vibration of some kind. I dont know if it comes from the motor or something is loose, I do have a slightly bad rear engine mount, I revved the motor to 4k rpms in park to see if it was the engine itself, but it wasnt it sounded normal. It only does it while driving and half throttle. Anybody else had this issue? ALso car has been wineing/ humming since I bout it a year almost 2 years ago, is it alternator? its just at low speeds though below 55 mph. And my car just hit 250,000 miles today on my birthday lol.