Rpm gauges

What is your question?

My rpm and temperature gauges go down abruptly and go back up again,the lock of the door makes a clicking sound at the same time. The csr stalls when this happen. It does it while driving or just turning it on. The problem goes away and comeback. New o2 sensors, solenoids, camshaft and crankshaft sensors, timing chain checked. No codes. I’d read that it could be ecm, tcm, lose ground wire, etc. I will appreciate the help.

What makes this problem better or worse?

It happens either with the engine cold or hot

How long has your 2010 Chevrolet Equinox had this problem?

A few weeks.