00SIBOOST

Alright another problem guys my car when you give it steady gas( cruising) it goes from very rich to lean and studders when it hits all the way lean my car studders as it goes back and forth to rich to lean my fuel set up is vortech 12;1 FMU 255 walbro and 310s could my RCs have met their match with this set up i am going hondata soon but i need to know if it could be a major problem thanks

lugnuts

on the cars i work on that is the result of the O2 correction trying to compensate for the large injectors. So the correction, being fairly slow, leans it out 25% and then it bucks badly until its dumb *** realizes that it over-shot....then comes the 25% correction back to "zero", and then some positive correction.....rinse and repeat.....
You may be running a lot of static fuel pressure.....just as a test unplug the O2 sensor and drive it around, see where the a/f ratio is at light load(cruise) , if it is very rich then back the pressure down a bit or get smaller injectors. I would think 12-1 is a lot of gain for a FMU isnt it?