Engine runs rough, no mil, no miss fire

I've already gone through the testing, and there is NO miss fire. Everything comes out ok, doesn't feel bad under a load, no loss of power, and it doesn't die out, the fuel pressure is at factory specs, spark plugs are fairly new along with the wires, cap and rotor.

Already checked vaccum, no leaks and cleaned the throttle plate. Any other ideas besides what I've already posted?

I used choke/throttle plate cleaner to check for leaks after visual inspection, that was one of the first things I did. The wires are in order. Is it NOT possible that the belt jumped a tooth, or am I just chasing my tail here? No mil, no miss fire, no vaccum leak, egr was clean, thottlebody was clean. If there was a vaccum leak affecting it like this I would have at least a lean code, if the compression was an issue I would have a miss code most likely a P0300. I don't know I'm lost here.

See that's a good point, thank you it starts relatively easy and it drives pretty well I never thought a motor mount, I'm going to check tba later

Well I have to say thank you I've been a mechanic for over 15 years and this is the first time I've ever been on a site like this it's a friends car and I guess I gt a little aggravated it's rare I get stumped like that if I came off rude to anyone I do have to apologize thank you to everyone for your suggestions and idea thank you for steering me in the right direction