I recently bought a 2005 ltd coupe. It was in pretty rough shape, but ran well. It looks much nicer now, new door panels, interior panels tightened up, but I am experiencing a disturbing throttle lag problem. I do the throttle reset and it works for a while, but will happen again. I have been on two long drives (two to three hrs each) and the problem happend both times. When it happens, I put my foot to the floor and it took forever (several seconds) for the throttle to slowly engage. I know this has to be caused by something wrong as if this was a normal problem no one would drive these cars. What should I look for to slove this problem? I really love this car but it is undrivable under the current conditions.