What is making my base catch on fire?

[Joe]

So, I'm playing along and all of a sudden, fire starts poping up everywhere. I put start putting them out by hand as it seems just something random. I finally come to the conclusion that something must be causing it so I made a backup of my world, to see if I could find what it was. I destroyed every machine and fire is still being created.

So, my base consists only of the basic TE and IC2 machines, tinkers smeltery, max size railcraft boiler with 18 steam dynomos connected to redstone conduits that power a mining drill, tree farm a, sheep farm.
I just started adding my AE drives when it started.
I'm also playing the the Tech World 2 modpack.
Anyone have any ideas what is?

Edit, I'm kinda perplexed. I had the idea that "I" (the character) was actually causing the fire. So I killed the character and the fire stoped. hmmmm...

 

[Padfoote]

Do you have a (I believe this is the correct name) Firestone from RailCraft on you? IIRC, those will cause flames to randomly spawn while you hold it.

 

[Strikingwolf]

What pack are you using?
Does it have gascraft?
Do you have a Firestone on you?

 

[utterablehawk675]

Youre carrying firestone.

 

[Bellaabzug21]

It could be gascraft, badly placed lava, a firestone, or a demonic chicken.

 

[Ausyarr]

all i can think of is a lava pool several block under your house.