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Hi Im David, is all of this just happening in reverse? how do it drive in the forward gears?
ok. well since reverse uses the highest pressure of all of the gears, you may have a reverse solenoid issue or a line pressure issue.
You'll need to have the line pressure tested. the pressures should stay at spec at all times. it seems that they arent doing that at slow speeds.
have you unplugged the maf and tried going into reverse?
try it when you can
have you checked the tranny fluid color and smell?
I need you to drive up a hill and stop. Now place it in neutral and roll backwards about 3-5 mph and place it in reverse while rolling. If it does not stall then hit the gas a little and see if it accelerates in reverse. If it will then start slowing down to a stop while remaning in reverse. If it stalls when you come to a stop then you have a concern in the trans with the torque converter clutch locked up or the reverse clutch faulty and using to much fluid pressure from a internal leak and starving the converter clutch thus makeing it engage