SupaDoopa

I was driving my 03' Evo and when I got on it at a high speed approximately at 100 and climbing, it seemed to hesitate a little as if it were tiny almost non-existant bucking you could BARELY feel. That later turned into bucking and backfiring. My service light just came on. I am running alcohol which is full. I checked vaccuum hoses for kinks and rips which I can't find. My next step is to replace all of the hoses and see what happens, but the engine light and heavy backfiring scares me a little. I am running a 10.5 hotside Evo IX turbo with a Buschur front mount and all the appropriate piping. I am not sure if my Walboro 255 is malfunctioning but the wideband seems to read 16.00 while it cycles until the car actually heats up a little which it never did before. Recently, the start ups seem to be getting a little more violent. Note I do run 280 COMP cams. Any ideas where I should look? I am obviously going to get the light checked but I don't really want to be running it in the streets. It's too the point if I give it decent gas off from a start [not really launching, but a good amount of throttle], it backfires like a straight tommy gun.

SupaDoopa

Here is also the relevent mod list as far as engine/boost/etc. so you at least know what I'm working with:

All dyno tuning done by Jack_of_trades on a dyno.
2 way ECU map
Basically my ecu is running the most up to date rom. Complete with all the goodies: no lift to shift, valet, knock "light".
Ported MUSE cast manifold
Evo IX turbo (18k miles) w/ ported FP 10.5 hotside
Forge wastegate actuator
Ported RNR 3" O2 housing
RNR 3" tbe (no cat)
GM electronic boost control
Evo X JDM MAP sensor
Dejon 3" intake
K&N air filter
1g DSM bov. Modded to hold 40psi
Buschur Racing Race FMIC w/ lower, and outlet pipe
Buschur Racing upper intercooler pipe
BR mini battery kit w/ brand new Odyssey battery
SMC alky injection w/ Aquamist flow sensor and gauge
Comp 280* cams
Rewired Walbro 255 fuel pump
NGK AFX wideband
ACT Streetlite flywheel
ACT 2900lb pressure plate w/ 6 puck disc
Buschur Racing shfiter bushing
Stainless steel clutch line
Defi D boost gauge
Aquamist alky flow gauge