[nicku]

So I was on highway today.....in the beginning of the driving, the car's a/r ratio was 14-15 when I was cruising on highway. But once a while, it jumped to 18 for like half second and jump back to 14-15. When it jumped to 17-18 at the same time, the battery voltage went down to low 13V to high 12V. After I went off highway, whenever I came to a stop, the af ratio went up to lean, but when I was driving, it became normal again. So I went to dinner, and after dinner I was on highway again. I was on 5th gear cruising about 75mph with rpm about 3000 rpm. And the wideband just showed "RICH". When I let go the gas pedal or gave it more gas, the car started bogging really bad. And finally it kept jumping from "lean" to "rich" and the car was losing power. Suddenly the car just died on me on highway. The exhaust had a lot of smoke coming out with fuel smell. I could hardly start the car, but whenever I started it, the car was choking really bad. I could not even drive it.

Things I have done to my car so far:
nismo 555 cc injectors
safc2 with 33% fuel decrease across the board
stock boost
walbro 250
stock sr20 maf (I changed to z32 maf but for some reason the car became running really lean. So I changed back. And the two wires with the rubber and metal wires cover were taken off the rubber cover because I had to connect the z32 maf. I dont know whether or not it will affect the maf singal reading if I take off the rubber metal wires cover)

My setup
redtop
s15 t28
nismo 555cc
safc2
walbro250

I dont even know what do I start now....please throw some ideas