I have a 1990 4 cyl 5 speed trooper. It periodically has a "roaming" idle when in neutral or the clutch is engaged. Now that the warmer months are here it seems to be happening every time I drive. First of all, does this sound like an IAC problem? I realize it could be a number of things causing this and have already replaced the old vacuum hoses. Also, where exactly is the IAC valve located and what are some tips for cleaning/replacing said valve? I have video of the rough idle in progress if anyone is interested.