I have a 1999 S70 T5 with 113000 miles. Check Engine light came on with code P1171 LONG TERM FUEL TRIM. I changed the air cleaner filter, MAF Sensor and related vacuum lines to no avail. There is a chirping sound when the car is in gear and revving out of or back down into idle, otherwise the car runs great, good gas mileage etc... When I start the car for the first time after reconnecting the battery, (to clear the codes,) the idle cycles high then real low a dozen times before it settles down. What do you think it might be? Any information would help.
Thanks,
Tony