Sentra 2001 (30,000 miles) accelerator gets a little sticky. Dealer has cleaned once and it is better but would like to know specifics if I decide to do my self in future. Dealer at first send air filter was to be changed at 15000 miles. I showed that ny manuals send every 30,000 miles (which I did) dealer cleaned at no cost. Good for him and me!. Thanks in advance. Lon