Well somedays when i floor my car it has some pull for being a v6 when im crusing down the road then others its like barely climbing rpms why is that is it because im in 3rd or 4th at such a low rpm that it really dont move and if this is why the only way to prevent this when flooring it is to manually shift it? Also when i cruise the car down the road and have my foot off the gas then floor it the car revs up really fast to like 1,200 to 4,500 in no time at all then goes back down to like 3,000 is this normal if not what could be the problem?

 

could be a problem with the converter not working correctly.