Could Chain tensioner cause P1191 error?

Only noticed 2 times in last 50 or so start ups
COLD morning, idle sounds fine, start to accelerate and move - chattering sound, lasting only about 30 seconds. by the time I pull over, lift the hood, its gone.
First figuring its an old engine, cold thick oil and it was lifters rattling. Read others suspect this same chatter as chain tensioner?? Can chain tensioner skew DME to give me "rich" in one bank??

THANKS!

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2004, X5, 3.0, 202k+