glad you got her fixed.

thaforce wrote:An update on the status of my "shudder". I had not owned the truck very long when I first noticed the symptoms. The problem ended up not being with the transmission or torque converter at all. I was having a misfire issue, but not severe enough to throw an engine code. I did a basic tune up to the vehicle, new plugs, wires, air filter, fuel filter ect. and the problem is gone. I would have definitely lost a bet on the solution to the problem, but read of others having a similar issue. I figured for no more than a tune up cost, it would be my first step to troubleshoot the problem. There ended up being 2 plugs that were pretty loose and one wire that looked good, but fell apart in my hands when I went to replace it.

Since the tune up the Silverado hasn't missed a beat and no longer seems to bog down on the hills at highway speeds.