I've heard of that happening on a gt, and it was from water hitting the wire on the crank sensor at the bottom. Idk if its an issue with the v6 tho. secure that wire, and give it a test. otherwise you can spray water at different things on the bottom until you can make it happen again. Could even be the belt slipping, but i would expect some noises from that. careful though if you spray water. try to only get things that would get hit with rainwater.
2002 GT 5sp. 16x,xxx miles
Steeda Exhaust, C&L plenum, BBK Throttle Body, Steeda Underdrive, Steeda short throw, unknown stage clutch. Rear main leak. Compressor seal leak. Steeda lower control arms. good tires.