I need some feedback. I have a 2007 4.0 V6 Runner with 54,000 miles on it. A year ago I replaced the air filter with a K&N air filter and put new plugs in. Other than that I have done oil changes. In the last few months I've noticed the gas pedal when pressed takes a moment to respond. It feels sluggish and unresponsive. I've tried to put 93 in more than one tank and it hasn't made a difference. I researches to see if I needed to replace the fuel filter and from what I gather this is not necessary. It is hot here right now and I use the A/C quite a bit. A while back I couldn't even tell the air was on. I'm scratching my head. If anyone has any suggestions please share them. It would be greatly appreciated.