Probably not that helpful but had exactly the same issue recently. Turned out that the filter had almost come off my intake pipe. First glance I wasn't specifically looking for it and didn't notice a thing but after I had a closer look the worm clamp wasn't tight enough and there was a big gap between the pipe and filter letting a tonne more air in. The tune obviously couldn't cope and the car stalled every time I didn't have my foot on the gas. No CELs either and power steering stopped just like yours. I'd check for a leak first. Sounds obvious but like I said, I missed it on first glance.