4 ms·It was a grounding problem. It is always a grounding problem.by JorgeGT 9y agoIt was a grounding problem. It is always a grounding problem.bdamm 9y agoThe GM badge should have been the clue, really.jaclaz 9y ago>It is always a grounding problem. ... or a cold solder joint, very often a cold solder joint on the ground connection ... ;)