M6 1995 z28. I rev my eng in neutral and the mph raises too. Is this computer feedback? Bad ground?

 

dont think its a problem but mine does it too. was kinda curious when i first saw it tho

 

Bad ground sounds like a possibility.

 

I'm trying to find a wiring diagram that shows all of the grounds. I went over the harness 6 times and can't see any unattached connections / grounds. It's tough to see the harness that crosses over the M/T but I tried to feel up there the best I can.

Any wiring ground diagrams available?

 

many gm vehicles do this, not sure why but perfectly normal.