A little background info here: http://forums.2gnt.com/dcboard.php?az=show_topic&forum=8&topic_id=109423&mode=full

When building boost, it seems like the car has no power and will sputter and sometimes backfire. I just recently installed the turbo kit and now have all my gauges wired up inside the car but I don't have the exhaust done yet. I'm just running it with the star downpipe and stock front o2 sensor (the rear o2 is not connected, in case that matters). I have an Innovative wideband AFR gauge but I don't have anywhere to put it's o2 sensor yet.

Right now I'm just running the stock injectors, vortech FMU, Wally 255 pump, star's turbonetic wastegate (should be set at 7 psi). I don't have the boost controller connected yet so I shouldn't be building more than 7-8 psi. Fuel pressure is about 50 psi at idle. I also have a 3-wire FCD installed so unless I wired it wrong or it's not working, I don't think I should be experiencing fuel cut.

I checked all the vac/boost lines and didn't notice any leaks. Any one know what I should be looking for? I really wish I had the wideband installed so I could see what the A/F ratio is.

Why are you posting twice about the same problem?

You dont need the secondary O2 sensor. Install the wideband and put the O2 where your secondary sensor was. See what your AFR's are at when this happens. And if this happens ONLY when you try to go into boost it may be the FCD isnt adjusted properly. You need to tune the electronic fcd when you install it.
I see you say you need help tuning so I ask what do you have to tune with?

Agreed. This does not warrant a second post. Ammend your first post if you additional information.

Last, attempting to drive under boost with no tuning and no monitoring capabilities (e.g. WBO2) is playing Russian Roulette with a semi-automatic. Install it. No one can speculate why you are having an issue over the Internet when you cannot provide any engine data feedback.