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Hi, I’m Ron and I can help you.I have been in this business since 1975 and also teach automotive repair. I am confidentwe can resolve your problem together. Please understand that I don't know your skilllevel. I can't see, smell, hear, or touch the vehicle either, so it may take a few replies toget to satisfactory results. Please be patient!I also try to give all of the information you may need, expecting a “positive rating” inreturn. I will also continue assisting you after you have rated me, if necessary. If thereis any reason I cannot get a positive rating, please let me know why “in advance”, so Ican go another direction for you. I am sorry you’re having this problem; I’ll help youthrough it.
Looks like you have done most of my suggestions already. Next on the list is to see if you have a detent cable attached to your throttle. This cable can be out of adjustment or stretched out. If all that is good, then you will need to check out the transmission further by dropping the pan again and checking the valve body.
It's on the bottom of the throttle indeed the throttle cable.