funny transmission problem

got a 1990 contintal and the tranny jerks into 1st gear and from 2nd to 3rd it shifts fine and smooth but it wont go into 4th gear anybody has any idea whats wrong with thisand how to fix it :banghead:

I think that TV cables are used up to 91 with a plastic bushing that goes bad. Don't know a lot about auto trans but this is a know flaw and it made a big difference for the 85.
2articles to read.
http://www.lincolnsonline.com/article52.html
http://www.lincolnsonline.com/article60.html

Good luck and let us know.