LB7: Fpr?

Dec 2, 2006
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TN
I have a friend with a 02 LB7 with 212,000 miles. It seems to have a surge while idling. You can get on it in Park or Neturl, when coming back down to idle it'll surge and have a lope to it for a second. Sounds like the FPR to me, any thoughts? Balances rate are pretty good, 1 or 2 sitting at 3.00