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Hey folks, few days ago I noticed a chattering noise coming from the engine under hard acceleration, most noticeable in 2nd and 3rd gear over 4500rpm. I though maybe it was spark knock since I usually run 89. So I filled with 93 twice now and still hearing the noise. I can also hear the noise at idle while revving the engine, the noise comes when the boost needle begins to move. It almost sounds like it could be something vibrating in the dash or engine compartment. Could I have carbon build up already at 23k miles? I know carbon build up will make a chattering noise. I run nothing but Shell or Exon fuel and have changed the oil regularly. Any suggestions would be great. Thanks.:S
 
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