Download high/erratic idle and/or the MIL light on. In some cases, vacuum leak noise may be heard as well. There may be poor contact or loss of contact at various main ground points or electrical connections. Power steering pressure switch may be shorted with debris. Inlet manifold gasket may be leaking. Broadcast code and calibration part number may need to be updated. To correct this condition, follow the procedures outlined in this bulletin to determine proper diagnosing, inspection and correction of ground contact points for proper electrical contact, power steering pressure switch cleaning or replacement and power steering system flush, replacement of inlet manifold gasket, and/or PCM reprogramming. SERVICE PROCEDURE Please refer to the appropriate workshop manual for the correct diagnosing procedure and/or follow the service procedures outlined in this bulletin for the vehicle being serviced. 1. Inspect main ground points (refer to SB99-04-S001 for more information).