Ok so i have DSM 450 black tops (2nd gen) a walbro 255lph (high pressure). I set Uberdata to 450cc injectors and the thing runs really rich like 10's and 11's in the whole range (not boosted yet). Once in a while when I'm in heavy or medium vaccum (daily driving) I will all of a sudden get a very lean condition (pegging lean on plx) 18-19 A/F. It evens boggs bad confirming a lean condition. I have to let off the throlle for like 30 seconds then the A/F's go back to rich again in the same condition.

It's so random, I don't know whether its an injector failing, the resistor box, spark plugs, or the ECU doing it. Anyone have ideas