My dad has 1994 taurus with the 3.0 engine and a overdrive trans. the car has over 160,00 miles. while driving down the road the car will start to jerk and lose power. it feels like the car wants to stall. when he take his foot of the gas pedal the engine will level back out and runs fine again. he can be going at a steady speed and all of the sudden the car will start to do this. it is very random when this happens. the car seems to run well other this problem. he has installed new spark plugs. i drove his car to work one day it is a 1/2 drive and the car did this once for me each way. he had a 1995 taurus with 140,000 miles before he got this one and it did the same thing but, more severe. does anybody have any suggestions of what may be causing this to happen. we would both be very appreciative for the help.