2001 X5 3.0i - Record for most error codes at once?

[jimmygee]

A shop I use has been struggling with resolving issues of the X5 running rough, hunting horribly while idling and then stalling when idling or when I slow to a stop, as well as times when there is no power in accelleration that seems due to misfires. Just prior I had a history of service light lit due to O2 sensors error after a head gasket blew; they replaced the sensors. 2nd to last time they worked on it we still had other O2 sensor errors posting but also cam shaft sensor error and purge valve sensor codes posted.

They replaced those other sensors to resolve but still had service light lit, which I figured just needed a drive cycle to be completed before it would clear. However, the X5 was still running terribly rough as mentioned above, so I brought it back immediately, and they pursued a vacuum leak as likely cause. No error codes were visible to me using Torque at this time.

The shop looked at the rough running and initially thought it was a vac leak from a crack in the manifold but said they pinpointed the leak with smoke test to be in a vac tube running to the gas tank, which they corrected by replacing the tubing. This time they said it ran normally during their road test afterward but when I drove away, I immediately experienced same problem again; contacted the shop owner and was told to drive it more in order to allow lines to purge. Have only been putting top grade premium in for fuel.

Someone mentioned to me about possible coolant blow-by into a cylinder but coolant levels do not seem to be dropping.

Anyhow, today while driving a couple days into this attempt to drive it more per his request it was running terrible as described and stalled. Then upon restart, a number of warning lights illuminated all at once including ABS, Brake (amber), ASC triangle, EML among others. After restarting again and turning the steering wheel to full travel each way, I've now only got the ASC triangle, Brake (amber) and ABS lit; X5 still running horribly rough as described above though.

I pulled codes with Torque app and got a laundry list (see below).

P0300 - Cylinder Misfire Detected Random Cylinders
P0313 - Misfire Detected With Low Fuel
P1501 - Idle Speed Control Valve Stuck Closed
P1342 - Misfire During Start Cylinder 1
P1346 - Misfire During Start Cylinder 3
P1353 - Misfire Cylinder 6 With Fuel Cut-Off
P1351 - Misfire Cylinder 5 With Fuel Cut-Off
P0037 - HO2S 12 Heater Control Circuit Low
P0051 - HO2S 21 Heater Control Circuit Low
P0444 - Evaporative Emission Control System Purge Control Valve Circuit Open
P1344 - Misfire During Start Cylinder 2
P1349 - Misfire Cylinder 4 With Fuel Cut-Off

These codes include a number of sensors as well as an array of misfire errors, and more. For everything to post errors at once, I'm presuming an electrical or control issue. Anyone have any ideas what this shop has been missing or is now dealing with?

Thanks in advance!