When I did the accumulator work I did not notice any scoring in the bore. Both springs were intact and the piston looked to be in good shape. I replaced the springs and pistons anyways since I had the parts on hand. The new piston felt like it fit just a little bit more snug.
The car isn't...
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Did you check the resistance on the OSS sensor?
I have not - if that sensor was bad wouldn't it affect all of my shifts though? I will try and check it tonight.
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Here is a diagram of the valves.
Thanks - that's really helpful.
I have a 2000 Ford Mustang equipped with the 3.8L motor and an automatic transmission. The car has ~250K miles on it and both the engine and trans are original and neither has been rebuilt. The car runs great except for a harsh 1-2 shift. A while back I was driving it and the car felt like it...