Ok just recently I was driving my truck and before I last check the transmission fluid was fine red as it should. I was driving the truck and it recently would start to knock into and out of gear when I would press and release the throttle. And then just the other day it knock again after I started moving and it seemed as it poped out of 1st and 2nd and if it was trying to start moving from 3rd. have to rev to 2k rpm for a while as it slowly starts moving and it will not downshift when trying to go faster when say passing someone. I checked my fluid level the other day and found out it was very low but still a little bit on the dip stick. I ordered some ATF matic-j and installed but it still seems to be doing the same thing. Also my check engine light stays on and AT check light flashes like 6-8 times and goes off. I live pretty far away from a Nissan dealership and do not want to risk driving it that far right now. Any help would be great.