Took my 8 to dealer yesterday because it was jerking while driving almost like
A bad trany or a clogged fuel filter would do
the service tech tells me that their pcm flashing machine had a corrupt pcm flash file
has any body heard of this or have had this problem?

 

True. The last flash was buggy and was recalled. However, it you talk to them real nice they might just flash the PCM with the latest, good flash--original "M" I think. Be prepared for them to tell you it can't be done because it is apparently a very lengthy process involving reinstalling software on their WDS.

 

A "corrupt" file sound unlikely - engine control upgrade mechanisms usually include checksums to assure file integrity and a verification that the upload procedure was performed correctly.

There is a discussion about problems with a recent software version though, altough I can't imagine it to have such strong effects like you describe. After all, the update has certainly undergone testing, even if other problems have surfaced later.

I had mine reflashed due to a flodding incident this week (no idea from which to which version to be honest, probably "L" to "M") and so far the car feels slightly torquier.