Weird ticking or knocking sound at 2,000 RPMs?

I got an jdm engine and clutch replaced after the past engine blew up. My car is either making a ticking or knocking noise at 2,000 RPMs to 2,500 RPMs then goes away. The engine I bought has 55,000 miles. The ticking or knocking doesn’t happen when I’m at idle and rev up to 2,000 RPMs to 2,500 RPMs. This only happens when driving. Side note: engine feels fine when driving but it also has a rough start and sometimes shakes a bit on idle, but RPMs just move a little from 600 RPMs to 700 RPMs.