I have a 95 Dodge Caravan that's starting to have transmission problems. Occasionally the torque converter clutch doesn't release, even in first gear. I have to put it in neutral to keep from stalling the engine. I have read that the same solenoid that controls the lockup also controls first gear - perhaps because the 2 functions are not required to occur at the same time- which leads me to believe that the tcc does not receive whatever pressure/signal it uses to do the lockup when the trans is in first gear. So why might this happen? Could it be a valve that is sticking?