Car Won't stay running after engine swap

[[ion] C2]

Originally Posted by crankycowboy

I will give this a go and report back. Thanks.

In case you're curious, the reason behind my suggestion:

O2 sensor might suck and is maxing rich occasionally, causing car to pull all fuel til it corrects it. Mine currently is failing and sometimes does this making my car die, lol, even though the tune is perfect and it runs smooth in open loop (no O2 sensor input). My air/fuel ratio bounces around too much lately with the O2 sensor active; it overshoots a lot and is generally annoying due to it maxing rich/lean a lot because it's not moving fast/accurately enough to maintain a proper control on the ratio.