Just noticed on my way home today an odd drag feeling on my 2000 GT. There was no AC on at the time. I would be cruising around 70-71ish, and around 2200-2300 rpm, and the RPMs would dip down to about 2100 for a second or 2 (you could feel the car slightly slow down), then jump up to 2500 or so for a second or 2, then steady back down around 2200. It did this (that I noticed) about 10-12 times (I have a few of them logged with dashcommand and a bluetooth OBD module, but not sure the PIDS I had set would really help much). I'm not sure if it's related or not, but I'm having an issue with my AC making idle surge up and down (and you CAN feel it if it's on and at a cruising speed as well), but the AC was completely off, windows down at the time it happened. (AC acts like this video when it happens, not my video, but same symptom: https://www.youtube.com/watch?v=nInBlmrO4CU). I also have a slight leak on the hydroboost module, and it might need a tiny bit of fluid in the steering system due to that. We're going to work on the AC issue Friday, check the freon level (it blows damn cold when it's running though), and the high/low pressure sensors (low pressure was the guys problem in the video). Could the AC be kicking in even though it's turned off, dragging down the RPMS for a few seconds, then cutting off? Or anybody got any ideas as to what could be causing it? My dashcommand exports ScanXL compatible logs (I also have a Diablo Predator I can log with, just not 100% sure how to get 'em off the device, lol), and if anybody can tell me what pids I need to monitor I can get a log of either or both problems.. The car has about 170k on it, I've replaced the IAC with a new motocraft one, changed out all the COPS recently, done plugs recently, cleaned the MAF about a month ago (when I replaced the cheap CAI I had on it with a better K&N). Also replaced about half of the hose to the evap system (need to finish the rest of it, just haven't had a chance to get it on a lift).