I have a 92 Dodge Dynasty with a 3.3L V6 that every once and a while (usually when the weather gets warmer) it seems that the engine starts to idle kind of rough and then while I go to accelerate from either a red light, go up a hill or merge onto a highway the speedometer will start to drop and the engine starts sputtering and I can press the pedal down to the floor with no response from the engine. The first time it did it was starting out from a red light on about a 100 degree day. Second time was merging onto a highway (about 50 or so degrees) the second I hit 55. Check engine light does not come on and it usually fixes its self after pulling over and restarting the engine. I have all ready had the spark plugs and wires replaced. Any ideas what it could be?