Mr. Bob
Lets try for a starter the knock sensor it might be holding back on you retarding the timing when there's No pinging -its located on lower right front of engine under the exhaust manifold.
If the KS checks out Have the EST/ESC tested.
See position J in the illustration below
Thanks for the donation-more help needed come on back
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Saturday, January 26th, 2008 AT 3:44 PM