While it shouldn't make that big of a difference, do you have the A/C going? As the AC kicks on and off, you will often see a noticable difference in power. I would definately get the fuel system tested, but you will want to get a fuel induciton service for sure. With that kind of mileage, it could make a big difference. If you are at all mechanically inclined, id recommend cleaning the throttle body yourself. As gunk builds up in there, the throttle plate can stick, open or closed, giving you a high, or low idle. I know on my jeep they were constantly haveing recalls and TSBs about the trottle cable itself getting stuck and causing a high idle.
Now, does it ever die on you while your foot is on teh gas, or only while off the throttle?
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