I have a 03 gtp with 80k I started having problems with my car bogging down from 40mph to 65mph and sometimes the rpm will osilate or bouncing up and down. I was told it was the tcc solenoid locking up and was told to put in a switch where the brake pedal switch is that controls that that disengages the tcc solenoid. It worked great for a while but now even when the tcc is disengaged and even worse with it engaged. Also I do not have any codes coming up. Any ideas? Thank you!