Changed the plugs and coil packs still idle rough and chatters real bad when driving

Hello, sounds like you have a timing issue perhaps. If you're saying it "chatters" are you saying spark knock? Not sure which engine your van is equipped with, but if it's a 4.6 or 5.4 or even 6.8 liter engine, you could have cam timing issues, you could have base engine compression issues. So hard to say without hands on testing.