Thanks Fuse. Great information, but now I'm being told that the egr is fine but the scan is now showing that the #2 cylinder is misfiring. Mechanic said he changed the plugs, wires and fuel injector but it's still showing the cylinder is misfiring. I'm thinking that's probably the ticking sound I hear. The engine is a little bit rough but it gets a little rougher just before swiching gears. The mechanic has two others looking at the car with him, none of the three can figure it out. They're leaning towards a bad computer. (I've been wanting a new computer but not for my car.)

Looking at the engine myself is not an option. I know nothing about the engine aside from checking fluid levels.

Thanks again for the information.