What is used for closed and open loop?

[glock22_40]

I am having troubles with a sensor causing the car to stumble, misfire, and even pop through the intake at part throttle conditions. It never seems to do this when I first start the car, and never does it under full throttle conditions. I believe this is possibly from a sensor that is not being used during closed loop conditions, but is used during open loop. Does anyone know what sensors are used during each llop cycle? Thanks.

[5.0THIS]

Are you pulling any codes?

[glock22_40]

No, the ses light comes on occasionally but I don't get any constant memory codes. I thought at first maybe the opti, but I changed that and the ignition control module and still have the problem. I bought the car with the full length headers and off road y pipe already installed, so I assume the o2 sensors on there are the front 2 before the cat if I go to buy new ones, correct? Thanks.

[wicked_95z]

It may be a tuning issue. The computer uses different tables for WOT than it does for cruise. Did it just recently start doing this??

[glock22_40]

It started doing this some time after the madz28 tune was done. the only change that was performed shortly before was the installation of the moroso cold air kit, but I talked to Ian and he said there should be plenty of room in the tune for a cold air kit. When it started doing this on the way to work I noticed a plug wire burned on the header on the passenger side. I changed the plug wire and the plug, but it kept doilng the same thing. Next I changed the opti with a brand new GM unit, but the problem remained. I then changed the ignition control module, but still no fix. I am ready to pull my hair out on this one!!!!!!!!