99 Durango 5.9l 4x4 auto trans intermittent limp mode
 

Hello everyone I have a 99 D that will randomly and intermittently go in and out of limp mode. No dash warning lights, no code given with the code reader as well as the key flick method (if taht even works on gen 1). I've checked the trans fluid and it seems to be the same pinkish color it was when I put it in. I replaced the speed sensor on the transmission and the rear pumpkin. My next plan is to replace the solenoid pack but I'm confused as the the pass fail nature of the problem. Sometime it drives just find and other it puts down the road at 30mph and 2500-3000 rpm and wont shift when it decides to run or not seems pretty random. I thought it was worse when it was warmed up but now it seems to be the opposite. Any thoughts or experience that might help?