I have a 46RE in a 96 dakota, that has just started to have a delayed shift hard shift from 1-2 gear and and very delayed shift from 2-3 gear. When the trans does shift to 3rd gear..it will after a few seconds shift back down to 2nd gear. Fluid is not burnt, and is at correct level. I have adjusted the throttle cable, with no improvement. I hooked up a code reader..no codes are present. Any Suggestions on where to look/what to do next? thanks!