hmm. i've been sprayin wd40 and carb cleaner all over without change... will check tightness on intake manifold bolts though and spray wd40 around the intake manifold -> head area. i've been hearing a slight sound near the same area your issue was, but it could just be normal or the power steering sound.
per Cliff's suggestion after going over logs and my tune, i raised my base idle spark advance 3 degrees, flashing it tomorrow to see what happens
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