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I am sorry your having this problem
did this start out of the blue one day ?
has anything been done yet to correct this issue yet ?
is the check engine light on ? or do you know if there are any codes set in the computer ?
ok thank you for that information
with no light on the odds are the wiring and computer are fine and the shift solenoids are fine due to the fact you have 3rd and 4th gear
most of these issues are due to dirty fluid or sediment causing a valve to stick or bind in the valve body
the best action to take is to have a shop perform a transmission flush with a flush machine which will completely clean out the inside of the transmission then remove all the old fluid and add all new fluid
the odds are that will correct this issue
is by a rare chance it does NOT correct this issue then the pan would need to be removed and the valve body removed for inspection next
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