It is a little late to answer this. However, it may benefit to others who has not changed yet.
I have been very successful using CRC MAF cleaner for my cars without spending several hundreds of dollars. You can get it at Advance Auto parts. Spray sufficient amount onto the filament wires (very tiny steel wire in the middle of casing) several times and blow with soft air to let dry. DO NOT Touch with anything. It should improve your condition. At the same time change the spark plugs as well (if they are more than 50,000 miles). You will definitely see the difference.