I have had NGK's in both the S40 and our S70 ever since they were purchased, and they work great. I have never experienced any hesitation in either vehicle using the NGK's.

Please note, the S40 is not experiencing hesitation. What my daughter describes to me is describing is an extremely long delay before the car will accelerate. From a stop when pulling out into traffic, she says the car will not accelerate for what sounds like several seconds. She says the car will coast at least a half a car length out into the intersection before it will begin accelerating at all. She says it is like taking your foot off the brake when in gear, and not pressing the accelerator, even though she is pressing on the accelerator. She can press the accelerator all the way to the floor and it makes not difference. There is no response. Then all at once, it will begin acting like normal and accelerate normally. It really makes me think the throttle position sensor is going bad.

She lives about 130mi from me, so I have not had a chance to experience this for myself. It is an intermittent problem, though it is happening more frequently than in the past.

Thanks again for any ideas.
Rich