I started a thread about my speedo not working and I haven't had the time to really work on it but now a new problem has reared it's ugly head. Lately, not all the time, when I start my 1991 Caravan 3.3 2wd the throttle seems sticky. In fact about four times now when I start to drive the throttle goes to wide open. It goes wide open even when I have hardly touched the throttle. I have lubed the cables and all moving parts, they work freely and have replaced the throttle return spring. The last time it happened I shut the engine off and pulled the throttle back and felt a heavy resistance. I started the engine and everything was back to normal and the throttle worked freely. I've nearly rear ended a couple of cars. Thank goodness that the brakes are good. I know I should get rid of it but a medical problem has made that impossible to do right now. I need to get it reliable to get back and forth to work. Any help would be greatly appreciated.