Ground Issue?

94GT363

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I just got my car back from the shop a few weeks ago. Experiencing some bucking issue's.. currently have a ACT sensor on order as my resistance test showed it was faulty. I spotted this just before I was wrapping things up. Looks like somebody took a mig welder to it lol. What are the major ground's to have? I've got aluminum head's should they be grounded?
 

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94GT363

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Also I don't know what exactly the shop as done as far as ground's. Will be investigating sometime today
 

ttocs

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I read an article a while back that made me run a ground to my heads. If you think about it, the ground connection is extremely important there for the spark plugs. Sure there are bolts holding it to the block but after you get into the different nitride coatings they put on them it can effect the resistance.
 

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