1999 Chevy Suburban, 5.7 L. 147,000 miles, all power options feels like the exhaust is clogged at lower speeds

Check to see if you have dented or bent your exhaust pipe somewhere. Listening to the exhaust pipe and hearing a miss is like a proctologist telling you your tonsils are bad. Go to the other end of the truck and check there for any misses in the engine. You should get a code showing. You also should not tell us you have smooth running and acceleration. Check all the wiring even to all the sensors and make sure you have clean connections and they are secure. When you went into the ditch, you forced snow and/or dirt up onto your undercarriage, and the weight of the truck against the snow and possibly dirt caused some rearrangement under your truck.

Thank you.... I'll have my own mechanic check for a dent or bent pipe. I have to say it actually does sound like there's a "miss" at the tailpipe, like someone isn't breathing absolutely correctly, you can feel it, too, while idling and under 30 mph. With the hood open the engine sounds like it is running very smoothly and very quietly, and over 30 mph it accelerates very smoothly and the feeling of a "clog" goes away entirely. I figured that snow and dirt got into the undercarriage, I have gone thru the car wash several times with an undercarriage wash and it is better than it was, but still not the way it ran before going into the ditch - should have just called AAA to get me out - all this could have been avoided.

Calling triple A may not of avoided what was done, but it would have defeated the reason for the four wheel drive. And you son got to see how it's done.

He's 34 years old, 6' tall and 225 lbs, he's actually seen a lot in his life in general! He was the one that pushed my truck backward out of the ditch and UP the driveway hill. 4 wheel drive would have been totally useless had he not been with me to push! AAA would have meant no damage would have been done!