I have a 2001 kia sephia. I have only had it for a few months and I am a delivery driver. recently the car has had some problems ,occasionally, accellerating especially between 25 to 45. but after a few minutes is it goes away and the car will run normally for quite some time. this has not been a problem until the other day. I was in a parking lot about ready to leave to meet my friends for lunch. I've backed out of my parking spot it went to pull ford car pulled ford slightly then stop and would not move no matter how hard I press on the gas pedal I restarted the car and tried pulling forward again and it would not budge after a few times of moving the car in an hour drive is a car eventually move slowly engine revving loudly as if it was pulling with all of its might just to go 5 miles an hour but I have to keep moving because I was in a particularly busy part of the parking lot eventually I was able to move the car to empty area of the parking lot I turned the car off as it was running hot I let the engine rest for about 5 minutes then I turn the car on and let it idle until the radiator was able to bring it down to normal temperature and I was able to pull off and meet my friends for lunch car appears to be acting normal but I am concerned my engine does burn oil but I have been keeping up with the oil and I have ran treatments for this following the treatments directions and I have recently have an oil change all other fluids levels are normal including transmission fluid is it possible I might need my transmission fluid changed and filter changed or is it something else again I am a pizza delivery driver so I rely on my car for work.