This is my first post, though I have been an avid reader for quite some time. I'm up against a wall. I have a 1993 Ford Mustang who runs great. Starts fine, Idles even better, and works almost all the time. Except for 15% of the time, when I start to accelarate, she'll start to stall on me. This doesn't happen when I accelerate very slowly, but I have to drive like an old lady taking a full minute to get up to 40 miles an hour. If I go any faster, she'll start to stall, and then catch at the higher throttle position. The problem is that the car doesn't do it all the time. Just sometimes, seemingly randomly. I took it to your local podunk auto store and scanned it for codes and came up with 172,186,211,218,222,223,224. Following up what these meant, I replaced my heated oxygen sensor, Mass Air Flow sensor, Throttle positioning sensor, and Fuel Filter. After doing that, the only codes that I still have remaining are 211, 218, and 222. Not sure about 211 (Ignition PIP circuit fault?), but didn't think that the coil packs could be bad like 218 and 222 insinuate because she idles and run like a dream the rest of the time. I also did a key on-engine running test and came up with the codes 411 and 167. #167 tells me that the throttle control is poor during dynamic response, which is exactly the trouble that my car is having, but I don't know how to fix that. And #411 just told me that the test couldn't control the RPMs at low RPM levels. In addition to merely replacing the afore mentioned parts, I also cleaned out the throttle body and air intake valves really well on two seperate occasions. The plugs and wires are only about 6,000 miles old. After I got the #167 code, I also replaced my Throttle Position Sensor again just in case I received a bad part, but to no avail. I then started to think it was the fuel pump, but I can hear the fuel pump prime every time I turn on the key and she always starts and runs fine as long as I don't adjust the throttle at all. I feel about to give up... at the very least I need to know some solid ideas of where to go next before I spend another $600 on parts that won't fix anything. Please help?