So I've noticed in the passed few days since is been hot my truck wants to surge when accelerating and sometimes it acts like it doesn't want to change to 3rd gear. Ive inspected all the vacuum lines, and fuel filter. Trans fluid is fine, oil is slightly low. also the engine is running at about 200˚f when it normally runs at 190˚f, so I'm gonna check all the vacuum lines thoroughly and replace one and if i still don't find anything wrong my dad suggested changing the thermostat from 190 to a 160 and putting new coolant in it, since its running hotter than normal. Any ideas whats wrong? also The motor bogs down when it doesn't want to change gears, but once it changes its fine. theres no pattern to any of these symptoms so far only when its hot out side or the motor temp has increased.