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Re: 4L60E shift issues.
Aside from simple things like; is the harness connection good, is it full of fluid, does it have a good cooler?
The epc valve can actually stick all the way open or closed, and cause wacky line pressures. It could be a failed part that should have been replaced, or could just be "off" a bit. I don't know much about adjusting it, only seen it replaced due to failure.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING 
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