You will loose all throttle response. There will be no warning signs, it just does it. The wrench will come on, spits and spurts. She actually had to find a safe place to pull off and put car in park, turn off, wait about 30 seconds, start car, then it is fine for awhile. The car goes into "limp mode", but if you are in heavy traffic, its all you can do to not to get hit. Here is the part number off our bad one 9L8F-9F991-BE. I think they got a bad batch of throttle assemblies. Here is the part number of the new one DS7Z-9E926-D, think its an updated part.