Possible CFG issue

I've been making adjustments to make the handling a bit more realistic for this L-188. Now it has a strange glitch. It's like the aircraft has epilepsy. When I load the aircraft to fly it jerks and shakes all over without me touching any controls.
Anyone got a clue what could be causing this? It'll even kick off some tire smoke once in a while.
It has to do with changing fuel in the game. If I don't mess with it, the aircraft is steady, if I change the fuel setting it gets all jittery. I can change it in the CFG file and do a clean load and it is fine, but when I change in the game, it goes nuts.
Anyone got a clue what could be causing this? It'll even kick off some tire smoke once in a while.

It has to do with changing fuel in the game. If I don't mess with it, the aircraft is steady, if I change the fuel setting it gets all jittery. I can change it in the CFG file and do a clean load and it is fine, but when I change in the game, it goes nuts.