2001 vibrates, flutters in drive

Hello. I have a 2001 Intrigue. I noticed a few weeks ago it was vibrating while in drive and starts rough. In neutral it doesn't do it. I changed the plugs and did an oil change, no help. I have no check engine light or anything???? Any help would be appreciated. Thanks.

My guesses are motor mounts, tranny mounts. Check to see if any of the rubber is torn on them. Have you cleaned out the throttle body? It's very easy to do. Might as well do air, fuel filter, and PCV.
The PCV is under the plastic shield on top of the motor in the valve cover. The fuel filter I have found is easiest with using ramps on the rear tires. I can get under the car enough to break the rusty stuff free. It is underneath of the car around the drivers seat/passenger footwell area. Make sure to take out the fuel pump fuse and start the car till it dies. Crank it a few times to make sure pressure is gone. Replace the fuse so you don't forget about it later.