Starting to run lean......

Just today I noticed my Civic starting to lean out under boost (7psi). This is weird because it has never happened before. I just did a tune-up and used the EXACT same plugs as before. I replaced the cap and rotor as well. Running 93 octane. What gives?? I hope someone has experienced this already.....

I just put my Vortech 8:1 FMU back on and the same problem. Starts off rich and then starts to lean out. What's the chance of my O2 sensor giving my AFR gauge a false reading?

Are your plugs uniform in color...?

Is you A/F gauge changing a couple + times a second, or does seem to be sluggish as compared before...?

This is the time, when you need a inside fuel pressure gauge.... hehehe

"Noth'in like Induction..." ;)