Ok, I finally fixed the coolant hose that goes to the back of my intake. Now when I start it up it runs fine in park. My car heats up as normal, the gauge goes as it usually should. When I put it in reverse or drive, it shudders. You can even hear the shudder in my exhaust. If I drive it, you can feel the shudder, and sometimes it shudders bigtime. I don't know where to look next. Could it be there's air in my coolant line? Could it be something else? Someone even told me it could be fouled spark plugs. Looking for any feedback, thanks in advance!