98 Tahoe front end shakes violently at times

I have a 98 tahoe that has Kelly tires. The dealer told me that I have radial pull. Had the tire changed & aligned the front end. Still shakes at times when hitting a bump or just accelerating. Took back to dealer & they said the EVO sensor was bad. Replaced it. Still Shakes. Back to the dealer, they re-rotated the tires & I asked them to check all front end & suspension parts, they did, or so they say, and she still shakes. I'm going to another dealer but wanted to see if anyone experienced this.
I had an old chevy van that did this, but it had a bad suspesnion shock, the tahoe doesn't.