This is my first post on this site, I'm not much of a forum person, so hopefully I did all this right! First off, I drive a 98 prelude base (automatic 4 spd sport shift). The car has always been fine, the transmission (as unreliable as I've heard they can be) has always run fine, with only few minor issues. However, lately my car has developed an idle problem. When I am in drive, say at a stop light or stop sign, my car feels as though it is trying to lunge forward, even when my foot is firmly on the brake. Every 2-3 seconds it will try to jump forward, then recede back, only to try again a second or two later. If I let off the gas, the car will idle like normal (Travel at 2-3mph) then pull back for a second like im on the brakes, but I'm not. Sometimes, when it does this, I let off the brake and my car does not even Idle up to speed like its supposed to for a second, before gaining speed and receding again. Also, as i drive the car, it seems to deteriorate. As it warms up, the throttle response gets sluggish, especially at low rpms, it will be significantly less responsive then when it is cold or recently started. It only seems to happen when I have been driving my car for at least 15-20 minutes. It also only seems to happen when it is warmer out. I've never noticed it doing this during winter season. Every where I look i have only seen threads about rough idle or idle fluctuations due to the IACV, but never seen anything about this problem that I have. My question is, does anyone think they may know what the problem is? It's not my 02's just has those replaced a few months ago. I also replaced my fuel filter, PCV, cleaned out my EGR valve, cleaned the throttle body and I've even tried adjusting the throttle cable in case that was too tight and possibly holding open the throttle when stopped. Any suggestions would be greatly appreciated! Thanks!