Finally isolated the issue to the crankshaft signal dropping out. I had already replaced sensor, this time I replaced the connector. The original crank sensor connector was covered in oil. So far the truck is running good again. Keeping my fingers crossed that this was the problem.
Since my initial post:
I did manage to get a code during an episode of jerking and loss of power. P0441 - most likely a secondary issue since I am not sure an EVAP solenoid could cause these types of problems.
I have replaced the ignition module and it did not solve the problem. the...
I have had an intermittent problem with my 99 Yukon for the last couple months. The Yukon will start jerking after driving a few miles. Once started it will keep going until it sits for a few hours. then it may happen again the next day or not again for a couple weeks. Here is a video...
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