I just recently took my car to a mechanic to get it checked. The motor has about 75,000 to 80,000 miles and still runs good. What's been bothering me is that the motor makes a constant clicking noise when it idles which the guy told me it's the valves that need adjusting and when "Vtec" kicks in at 4,500 RPM's it actually feels like I'm going slower, makes an EXTREMELY loud noise that's not coming from the exhaust, and the car shakes when "Vtec" goes in. Also I need someone to take a look at the car because the engine was swapped and I don't think they swapped it correctly because there are bolts missing every where on the motor. I would glady appreciate help, and thanks.