P0753 Code Question!

[kaymac]

Hello,

I have had my 2000 Lexus RX 300 since it had 90,000 miles on it. She was loved for by a fellow in California who was very intentional in her care. I have never had a problem with her until very recently.

Glenda has 229,000 miles on her now and I had to take her in to a mechanic, which told me her spark plugs and ignition coil needed replaced (which was right on track with her symptoms and what I read on here :)).

She drove fine for the first day, however the next I noticed a strange clicking/sparking noise. From what I know about the location of the spark plugs, I figured that would be it. I didn't drive her after, but for a couple of times for quick trips. During this time I noticed she was having a little bit of issues switching gears (it's a automatic), and when she starts her RPM's go up higher than usual, and don't settle in until after she runs for a bit - all of which is strange for this car.

The engine light code came on and I got it checked: P0753, Shift Solenoid A Electrical, and Shift Solenoid B Electrical. I know this has nothing to do with spark plugs, but rather the flow of the fluid in the transmission, but I wanted to double check with forum users before I start to play a game of cat and mouse with mechanics.

Please advise - THANK YOU!!