The idler arm is most likely the part that has the car feeling like its 'wandering' all over the road. Replace it first and see if the problem just resolves after that. If your front springs are rusted or smashed they will have to be replaced same time. The spacers are the next thing I was going to look at but I have Cutlass and the issue of meandering steering is more common on Cutlass than Malibu w the 17 inch billets. You should not have to run spacers on Malibu to cure these symptoms; the idler arm, springs, shocks, and bushings should solve it all. If you replace all that and the car still sucks the control arms are next, but you should really just bite down and purchase them when the rest of the front end is already in shambles. That's your one shot to do all the pieces same time and have a good alignment. Another issue to check for was that I noticed the power steering fluid spurned a leak after I got the Billets. When the power steering leak happened I thought something else was going wrong for days until I happened to find it. There was not a noise, it was just a long delay in communication from the steering wheel to the ground, like at least a half second to .75 second delay. I drove around for a few weeks telling myself 'its probably just the added weight of the new rims' but thats a cop out. The stock system can get a leak or some bubbles in it easily after putting bigger rims on the car, check to make sure it has not developed a small leak or is just going defective on you. There should be NO delay between steering and the wheels reacting on the ground or else the power steering components just need replaced. When I got honest with myself and redid all the power steering equipment there was no longer any delay between moving the steering wheel and the wheels responding. With the heavier 17's under the car a power steering delay could be the difference between crashing or not!