2001 Chevy Blazer vehicle sways side to side

Hello ryash9500

I believe you just need wheel alignment.

The vehicle wander because of inadequate caster setting, or incorrect side-to-side caster setting or excessive front or rear toe out or there is a bent steering/suspension component.
One of these may cause the problem.
Anytime a major suspension work is done on a vehicle, wheel alignment is necessary.

thank you for the feedback. the work (idler arm) was done at chevy dealership and they say (and billed) me for an allignment as well.

switch the tires from side to side.
if the pull goes away or pulls to the other side after switching the tires, the problem is with the tires, not the alignment.
The steering will pull to the side with the least positive caster,excessive positive caster on the left front wheel may cause steering pull to the right.
the steering tends to pull to the side with the most positive camber.

thank you. I tried it and driving was 10x worse actually. So I put the front tires back the way they were before, however I used proper torque settings on each...now driving considerably better.

note...no lugs were loose when I removed them, however several were much harder than others. I wouldnt think it would be causing.

I'm even more confused now...

Hello ryash9500

raise the wheels off the ground and start the engine. If the steering wheel starts to turn all by itself, power steering work is what is needed here, not an alignment.