No mater if the jeep is hot or cold it does not start easily. I noticed that it starts a little better with the temperature sending unit disconnected ( the rear one on the manifold ). I have replaced the temperature sending unit a few times and I don't think I am getting the right one even from the dealer, the one I get looks just like the one by the thermostat housing is there a difference between the two? I have changed the spark plugs, cap and rooter, air filter even tried another computer. What do I do?