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we need vastly more symptoms then that,sorry
if the engine surges, that is first. (surges in 1 gear)
but if a transmission down shifts that is normal, rpm rises
(after all its a lower gear) (higher numeric ratio)
find any machanic in town
ask him test drive it.!
10 min.later he wilt tell you
its trans issues.
or its engine, super easy this is driving.
seems you can not, and learning is 1hour in car class..or 10x that lacking facts of drive train functions.
stop guessing. why spend cash on a useless sensor now.
spend cash on $1 shop diagnosis and WIN.
i promise !
or get it scanned.
and post all those DTC errors. P0700? and more.
Check your Transmission fluid level with the car warm, also if when you are driving your car, and you get a very loud whinning sound then your torque converter is shot and you will need to replace it. This sounds like a transmission issue that would be best diagnosed by either a transmission shop or a mechanic.
its the TCM transmission computer system. there is a computer inside the console shifting unit, one on top of the steering column just behind the carpet. they will tell you to replace the computer. but which one is the issue. replace the small one at the shifter first. then if that doesnt fix it then replace the big one under the dash. the dealer wants 500 for the part alone at the shifter, and 800 for the big one with installation. its easy to install dont pay them for that. instructions are on the internet. you need to take the car back. EVERY GC has transmission electronics problems.
have the same problem with 1999 mazda pickup try flushing the tranny and put in a new filter replace one quart of tranny fluid with some lucas trans fix and see if this helps it any, was told the tranny will need to be rebuilt.
Yes you have a Transmission problem that is only going to get worse.
There is nothing to do now that will solve this problem. You can pull the dipstick and look/smell the fluid to verify this but unfortunately the only thing to do now is have the transmission rebuilt/replaced.
Sorry to be the bearer of bad news.