I do, but it's MAF trickery related. Slight ping at tip in at low RPM in high gear, all due to load miscalculation by the PCM.
That's the biggest reason why a chip or some other device that changes the EEPROM tables on the PCM is superior to S-AFC or recalibrated MAFs.
Read up:
http://www.mustangworks.com/articles/electronics/InductionBlues.html 
