After having issues with my other car,had a chance to look at mine and just after a year look at the corrosion buildup,the entire ECU and F.I system works on this engine ground wire,a bad corroded ground can cause performance in almost any circuit voltage drop and can cause hesitation,so the best thing to do is grab a fine sandpaper and clean the corrosion at both edges,after finished add bome dielectric grease,hope this helps someone,and never ground anything to this wire or the battery.
