First off, my car ran good before. Then the fan started hitting the hose underneath the top radiator hose. This caused the fan to stop spinning. I changed the hose and cut the end of the new one by 1 inch to make sure it wouldn't hit the fan this time, it worked except the car still overheats. And for extra fun, the car now starts bogging after 3000 rpm but before 4000rpm. It starts acting like it's running out of gas, if anyone knows what that's like. It'll start bogging even though it has a full tank and then after 4000rpm it goes back to accelarating smoothly. And it only acts this way when the car's at normal tempeture and gets worse as the car gets hotter. All I did was change the hose. What could be causing this?