A friend who is a ASE mechanic(and has a stellar reputation)helped me change out my old idler and pittman arms on my 97 GMC Sierra. He did not torque any of the bolts with a torque wrench and I'm just wondering if this should have been done? He said he has changed tons of them over the years and just zips everything together with the impact wrench or snugs them up with the ratchet and never has any problems. What are your thoughts on this. Are these parts sensitive to how tight you get the nuts and bolts tightened up? Thanks!