I have a 66' mustang coupe with the 200 motor and automatic transmission. I have had it for several years now though I haven't been able to drive it for 2 years because I moved and couldn't take it with me. This past week I got it running again and have been spending a bunch of time working on it. I remember it used to have an issue where the transmission didn't like to shift into park, but now it is much worse. Anyone have an idea where I should start with trouble shooting this?