I have a 1997 Grand Cherokee with 188,000 miles. On cold days- under 50 degrees, the first time the vehicle is driven out of the garage, the shift from second to third gear is delayed. It stays in second for an extra 3 -5 seconds than normal (automatic transmission). After it shifts from second to third the first time, there is no more delay. This event is recurring.
Is this problem due to a shift solenoid problem or a clogged transmission line or filter? Or something else?