i have a 1999 a4 quattro. during the last week i consistantly get a cylinder one misfire code(16685)and random misfire(16684). i have switched spark plugs and coil packs to different cylinders. swapted injectors to different cylinders and ran three tanks of fuel injector cleaner through to no avail. every morning cylinder one misfire with a blinking check engine light. but quits after warm up with no miss. i did the diy check on th n122 power output stage. and it checked good. so i though maybe it had to be cold to do it. so waited till next morning and actually switched n122 inputs 5 and 4. and also switched output numbers 1 and 2. to give a different path through the n122 but still fire the right plugs. but the misfire stayed in cylinder one. it shows almost 500 misfires in a minute and 0 when warm. all wires are also good from the computer all the way to the injectors and coil packs.

distributorless ignition. no cap to replace.