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About one month back I was fool enough to do high pressure wash in my car engine bay. Soon after that I felt rough idling and sense of engine was going to stall. Then my mechanic and I removed most of the sensors and connectors including MAF, ECU, Throttle body, coil packs, applied air and contact cleaner (Wurth). Problem was solved at that time but end up with a high RPM of 900-1000. (It was used to be at 700). Then did idle air volume learn from a place but it wasn’t operated by usual technician but it came down. But after driving for about 50 km ( after 2 days ) some kind of a jerky feeling started to feel while idle with specially AC on or while gear in D or R without AC. It also occur when cruising around 60kmph when OD engaged, torque converter locked and cruising RPM comes near 1400-1500 area. It doesn’t occur in RPM like 2000. Battery voltage didn’t dropped when this happened. After driving about 250km (I came back to work) I did a clean and removed MAF connector while engine was running (I just wanted to check MAF) and removed battery terminals for a while (2days) and allowed ECU to reset. Surprisingly it improved for few km and started again. After coming back (another 250km) did a sensor clean again and did a re-learn from a different scanner (x431) things got solved significantly and frequency of occurring went down and happened only at idle with lesser frequency. Later, in the scan report I saw load indicator was on while doing that even though everything was turn off (may be cabin light was on or car stereo panel lights stays on though it is turned off). I went over internet for read regarding this and saw “ Accelerator paddle release position learn and Throttle close position learn” should be performed prior to idle air volume learn. I changed MAF and O2 sensor later. Even though fuel figures came close to factory figures (16.2/16.6 kmpl) those symptoms didn’t improve. My next plan is to check fuel pump and AC (clutch or something) So, 1 What may be issue? 2 Is idle air volume learn is highly sensitive thing that need to follow exact procedure? 3 Is this condition relate to above thing or any other isolated condition? http://forum.autolanka.com/topic/15462-fb-15-idle-drop-issue/ this thread somewhat similar but not exactly similar