1995 Chevy Blazer shakes

o2 sensor just unscrews with a 7/8 wrench and you can install plug wire looms or brackets that they sell at the auto parts store.

I'm not sure how either of these would create a wobble? There is a special socket for 02 sensors, and the plug wires should be in looms...plastic pieces that the wires are routed in...02 sensors can require the use of a tourch to heat the pipe...