I have a 99 GT 35th LE with 100K on it. Driving to work going about 60-70 mph if I step on the gas, to pass someone, it starts hesitating and stuttering. Sometimes it will recover, and this is the only time it happens. Last weekend I replaced all of the ignition coils and it did start to run better but still is experiencing the same issue. No check engine light comes on, so I can't pull the code. I can be at a dead stop and take off, nothing happens. Only happens when I am going at a steady speed and try to pass someone. This happened a few weeks ago and the car stalled and would not stay running. Please help, not sure what else to replace.