I just bought my Tahoe and dumped a bunch of money into it because of prior neglect. Now for no reason the front end will shake really bad and then just stop. I just took it to Les Schwab and they said ABS module but they did not have the right stuff to talk to my truck to be sure. I live in a small town on the Oregon Coast with Very Little Mechanics. My ABS light does Not come on. Any ideas out there?