My TARDIS catches fire when I go into flight mode and if you can tell me how to fix it I would appreciate it.

This sounds a bit more like a bug to me. What were you doing before noticing this change?

This is actually a feature. It happens when you're tardis has taken a lot of damage, you can disable it by going in a game, clicking escape, clicking DM Options, and disable the particles.

 Yeah, but it still flies all funny and is all wibbly wobbly.