99 Boxster Check engine light issue ( Not Normal)

[porscherescuer]

Hi everyone,

I have a 99 Boxster with 90k miles. The cel has been on for a few months now. When the codes were checked it threw six codes. One for every o2 sensor and also maf sensor. I replaced all of the 02 sensors, which I thought was really odd that they would all go out at once. We erased the codes and they came back within 10 minutes. So I have just been driving and not worrying about it. This morning I was driving it and it started jerking slightly and got bogged down. Had the codes checked and it was the same codes. I replaced the maf sensor and cleared the codes. The car drives very good now and seems to have fixed the issue, however four 02 sensors, maf sensor and nearly $1000 later I still have a check engine light on. My indie told me he thought there might be a short or broken wire somewhere, probably something to do with the DME or a connection. I am stumped and they are booked up for several weeks. Does anyone have any clue where to begin? What am I looking for, and where? Thanks so much for any help. Surely someone has experienced a similar issue. To reiterate the car runs very good now and is averaging around 25 mpg.