Car won't idle. Spits and sputters at low throttle.

[LarryJoe]

So my car was running perfectly fine one night. The next morning I start it and it instantly dies on me. I started it back up and have it some gas. It was kinda hesitant to stay idling. I noticed my wideband had quit working. And now at low throttle it will buck and sputter and spit especially when cold. Under boost though the car pulls perfectly hard like nothing went wrong. Idle vac is at -20, I changed plugs and wires to no effect. Anyone know what could be wrong?

 

[iaintmaci]

I would look to see why your wideband quit. That seems like a good starting point. Possibly a sensor failure.

 

[LarryJoe]

I don't know why it would. The car is tuned on speed density btw. Anyone know of any sensors that sounds like it would cause this?

 

[genegoesfast]

Possibly a front o2 sensor, or a failed wideband sensor that was being used to simulate a narrowband o2.

 

[LarryJoe]

You think bad front o2 would not let it idle? The car is tuned on ds-map and its on speed density if I didn't already mention. I'm at a loss.

 

[LarryJoe]

The car is forced in open loop also so I don't think an o2 would cause this.