Engine ground locations?

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Jonesy92

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I’ve been looking into my “reduced engine power” issue for a few months now. I have a scan tool, and when I get the dreaded “ReP” I clear the code and continue driving. After about 3 clears I’m good for a few days. I’ve been told that I need to find the 4 major grounds, and clean them off. I’ve found 2 out of the 4 major grounds. I’ve been told there are 2 more, towards the firewall, behind the intake/valve covers. Anyone able to help me locate these? Diagrams, schematics, etc?
 

Rag231

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The one that I am trying to locate today is the one between the driver's door and fender area. I am searching for the pictures of that location now.
 

Rag231

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The one on the firewall is on the firewall between the brake system and engine. Almost exactly between the two.
 

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