yeah possibly... i checked all points on my harness, those two gounds at the top of the back of the intake mani were hand tight, so i went ahead and get em bolted down... idle is A LOT smoother now, BUT, it's surging, 1k-2k-1k-2k etc, and it still falling flat on it's face at exactly 4-4.5k rpm (just checked after tightening grounds)