If a major tune-up has not been done recently, that could be the cause. Replace the spark plugs, plug wires, fuel and air filters, etc. Also, replace the oxygen sensor. In addition, service the fuel injection system. Clean the carbon deposits from the throttle bore and idle passages. With 100,000 miles, you may have a partly plugged catalytic converter.
Thursday, January 20th, 2011 AT 10:19 PM