I am having a problem with overheating at times. It does not go all the way into the red but it is very close. I keep refilling with antifreeze but can't find a leak. I also have a problem with it being very sluggish on take off and going up hills. There are times when it won't start and when I tap on the oxygen sensor (I think) on top next to the air intake, it will start. I don't know if these problems are related. I am waiting to hear from the parts store on the cost and length of time to get a new sensor.