Very stupid problem and question!

I agree that it sounds like a throttle pressure (kickdown) linkage/adjustment problem. The linkage may have came unhooked or just need adjustment. That being the case get it repaired ASAP because when it is not functioning right it'll toast the trans real fast.

BTW: the condition Oldmanmopar described about not taking off with the shifter in low is easily remedied by installing a quality shift kit that replaces the cushion spring in the rear servo with a solid spacer. The cushion spring ma Mopar put in there to make it shift nice and soft can cause 1st to 2nd overlap when manual shifting a stock transmission. Overlap is very hard on a trans