I have a 99, and it has been running fine the last week (I just pulled it out of storage) and now it is running a little weird. When I was on the expressway yesterday, I was going about 70mph. I went to speed up to pass, but when I stepped on the gas, and the rpms got to 3500 the rpms kept dipping and going back up. At the same time, I was not able to accelerate. It did the same thing again today. Now it seems to be doing the same thing even from a dead stop.....Could this just be the old gas working itself out of the system?( I have only filled the tank twice since I started driving it agai) Or is this a much bigger issue? It sat for about 6 years, and only has 40,000 miles on it.....HELP!!!