My W203 was fitted a K&N filter before and recently it developed some intermittent stalls; which mainly happened just a few seconds after start/restart the engine; both cold and warm starts. After reading a few threads, I suspect that it was due to a dirty MAF sensor as the oil from K&N could mask the MAF sensor. To start it simple, I plan to buy a MAF cleaner spray to clean the MAF sensor first. However I found that it would be a bit too difficult for me to remove the entire airbox from the car and take it apart to get the MAF sensor cleaned.. Instead, I am wondering that if I can just open the air box and spray the cleaner in it? OR what is the simplest way to get the MAF cleaner cleaned in the W203? Many thanks in advance!