I have a 1999 3.2L ES that stalls while driving. For example, I will be driving down the freeway at 60 to 80 and it acts like the engine shuts off. RPM's go down to 0 and the green cruise control light comes on. Then within 1/2 a second the RPM's go back up (power as usual) and the cruise light shuts off. What could be causing this? If there is a known fix what is it?