Hello all. I haven't been very active on here in a couple of years (old screen name was OVER 9000!), but I just wanted to post up a problem that I was able to chase down in MY02. I am at 135,800 miles on the odometer currently and recently did a valve adjustment at 135,200. About a month ago I noticed that I started getting worse fuel economy than usual (barely 160 miles on a tank) and popped a CEL for misfires on all 4 cylinders and random misfires (P1399). I would clear the code and it would wait about a week then come back.So I started chasing down likely causes. I pulled the spark plugs, which had maybe 1,500 miles on them and were rather dark (showing signs of running rich), and swapped in new NGK laser platinums. CEL still came back a week later. After this the CEL started coming on within a few minutes of starting the car. I switched coil packs (one was replaced earlier this year) and still came back. At this point I had bought a bluetooth OBD2 reader for the S and ran Torque Pro to see what the engine was doing. My short term fuel trims were constantly seeing -20% on my STFT and would rarely get in the positive. I found that the negative values corresponded to running rich and that it was running very rich most of the time.Finally, I decided that it was likely a fuel issue. I took my injectors to Deatschwerks since they are local to me and had them clean/flow test my injectors. They came back with some interesting news that one of my injectors is outflowing the others! it was putting out almost 1.2 gallons more fuel an hour and had a slighting higher flow during the low pulse testing (simulating idle). I went about replacing the failing injector and learned a lesson about injectors along the way. Injectors are flow matched from the factory. Basically injectors are a mixed bag of flow rates (within a certain range of course) and the factory pairs 4 of them together with similar flow rates (likely within 1–2% variance). Chances are low that you will get an injector with a matching flow rate when ordering a single injector. Luckily a friend of mine found his 3 oem injectors from when he supercharged his S and I took all 3 of them into Deatschwerks and they picked the injector with the closest flow rate to the other injectors. I got the injectors back in about 4 days ago and it has been running like a champ and pulling a lot harder too since its not running super rich anymore! I just wanted to post up because it was a pain to go through and figure out, so I want to help the rest of you if you are having similar issues.Edit: Here are the Fuel Injector Test Results . The first and second picture are from the first test with the original 4 OE Keihein injectors. The 3rd pic is from the second test with a refurbished injector labeled as a 2000–2003 Honda S2000 injector from USCarburetors on Ebay. Obviously it was a different injector or a faulty one. The bottom line was that it was a stupid decision even if the injector was working properly because chances are, it would not have matched the other 3 injectors' flow rates. I have already requested to return it. I will upload results from the third test with the 3 additional OE injectors sometime tonight.