wiper delay problem
 

HI,i have 1990 gt , and well when i bought the car i negglected to check the wipers, they work alright but only on fast, and when i shut them off they stop anywhere on the windshield, after 2 yrs i've gotten good at shutting the wiper switch just when the wipers go down, but once again, i do NOt have delay or slow wipeing mode...i'm mechanically incline (bodyman) but hey i know it's not the wiper motor, cause i replaced it, i also replaced the wiper switch with a new ford part, and checked fuses, i even took it to the dealer and they said to leave the car there for a week, and still after 5 days nothing was found. can anyone help me? i'll try anything. e-mail me here or at elnenemalo@migente.com
CHEVYGUY, i tried taking the plastic cover off the wiper motor i hit it, and nothing still. I spoke to a biddy of mine and he said to check the wiper governor? does anyone have an idea, if this could be it, or if this wiper governor even exists?
and MIRACLEMAX, i tryed plying with the wiper motor contacts, and had no luck..