1998 Buick Century mileage: 72,000. If you can successfully pinpoint this problem, you should be President. The problem is rough idle. Service Engine Soon light comes on intermittently. We have replaced the wires, plugs, throttle position sensor, and idle air control valve. Performance improved (better acceleration, surging stopped), but the idle problem persists. Have checked for vacuum leaks, maybe not successfully? Should we bother with the oxygen sensor? EGR valve? PCV? Uughh! Can you help? Mechanics in our area have been no help.
have the same problem?
Thursday, October 14th, 2010 AT 6:57 PM