Awesome, congrats!
Shudder could be one or more loose spark plugs, that's what was wrong on my first Insight when I bought it. The coils are screwed on so they keep the plugs in the holes, but you lose power and get a shudder. Or a loose ground strap, etc . . . . a lot of things
New Accord V6 EGR valve is like 50 bucks with a gasket. EGR plate gasket is re-usable, I used my old one with no issues
Looking forward to your build
You need to get yourself one of those badass 3D printed shift knobs some guy on here makes!
