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Yes put a strut (threaded rod ) to clutch firewall area with large washers on each side to capture firewall flex and bend other of the rod to a 90 deg angle and attach to the inner fender. Adjust the nuts on the firewall side for no firewall flex. That little flex movement makes a big difference...

Continuity has nothing to due with a ground loop or noise interference, with complex electronic controls the OEMs take this into consideration when it is integrated into a vehicle. It costs nothing to run a separate ground for the ECM.

Try running a dedicated ground back to the battery.