Relist: I still need help.
I followed sparkbuoy's recommendation to replace the ignition module, but the problem persists. I also need to add the suburban will accelerate on its own about 500rpms and then just turn off. This all happens after the engine warms up.

Reply to Sparkybuoy's Post: Yes, the engine is shaking, its not misfiring and the idle speed is fine until it warms up, once it warms up either while driving or just letting it sit and idle for about 20 minutes, the erraticness will begin. It will accelerate then drop back down on its own, and get to the point to where it nears turning off and just bounce up and down until it finally just turns off. When I attempt to restart it, I notice black exhaust smoke coming out of the muffler and does that for about 20 seconds, then it goes away but. This happens everytime I start it after it stalls. When I first start to drive it, it behaves beautifully without any symptoms whatsoever. But after driving it 20 minutes or so, it starts doing its thing. If I accelerate the engine while in neutral, it will stay on, sputtering, but it stays on. But it has turned off while I am actually pressing the gas pedal in drive gear. I dont know if this is coincidence or not, but the exhaust does not smell like gunpowder or firecracker smoke after I changed the ignition module. That part went away. I hope this helps you with the diagnosis.

Reply to Sparkybuoy's Post: Yes, at first when the problem started, the check engine light would come on as the problem would begin. As recently as about a month ago the check engine light stopped turning on. The check engine light does turn on during the dash board self check when first turning on the engine so I know the bulb hasn't gone bad. But it will not turn on anymore when the problem begins. I do have a volt meter, but instead of checking these two sensors I'll just replace them. Thanks for your patience.