extreme bogging?

[JScoob]

I don't know what to call it. So I'll just describe it and hopefully someone has a better idea of whats happening...

I'm driving on the freeway, under some mild boost ~ 1 bar in my wrx (not stock, btw). My 2D is set to engage at 1/2 bar and I'm running a dual 0.8 and 0.9 nozzle on a 10% toluene mix on a 2.5L. My WI mix is 50/50 meth/water. I've been running on this for over a month without problems.

Then just last night, right after I exit, I stop at a light. Car is fine, idles ok. As the light turns and I try to accelerate, I can't. Its like the car is bogged or something. The engine has trouble turning over, I can feel 1 or more cylinders not even firing.

All the while a huge cloud of smoke is coming out of the tailpipe, I have just enough momentum to limp to a parking lot. Interestingly enough, no Check Engine yet. I turn off the engine and let it sit for a bit. I get brave/stupid and decide to try to start it. It doesn't like it...at first, but then the engine got a little better and I just sat there revving it until the engine sounded perfectly normal. I drove around the lot for a few minutes and decided I would risk continuing on...and I did so, everything was fine.

Now...my question is, wtf just happened to my car? My first guess is that I'm injecting too much water...ok. Fine. But why was the engine fine for over a month? Why all of a sudden now throw the hissy fit? Anyone else run into this problem?