I have a 2000 Honda Accord ex v6 when I have it in park the rpm jumps and also my d4 light blinks sometimes and when it does my car won't go are if I'm driving and it starts. It won't down shift... when its cold I have to let my car warm up r it won't shift in drive but once its warmed up it doesn't shift hard and has no problem except the rpm in park... someone told me it could be my throttle Position sinsor and my shift solenoid... can anyone help me please

 

Pull your d4 codes. There are howto's on youtube for how to do this. Report back here with the codes.