So here is what is happening. The car will run at normal temp for awhile and it may or may not(depending on the day) start to run hot. When it starts to run hot it jumps by little increments will get up to the red line and sometimes go over the redline at which time I shut it off. If it doesn't get to the redline it will jump around and I mean the temp jumps its not gradual. Once the engine starts to get hot like this it is worse at lower speeds and lower rpms and tends to approach the redline even at idle. If I rev the engine I can get it to cool back down. The car did this once over a week ago then went back to running normal for a week now just yesterday it started acting up again. My big question here is what does this sound like is going bad? I personally think the thermostat is sticking but not completely stuck so it is not opening up fully when it needs to and when I gas it the pump creates more pressure causing it to circulate more which cools it back down. What do you guys think?