Fuel Injection System - TBI: Testing: Surging

Ensure customer understands Transmission Converter Clutch (TCC) and A/C compressor operation. Check alternator output voltage. Repair alternator if output is less than 9 volts or greater than 16 volts.
If diagnostic scanner is available, check that VSS reading matches vehicle speedometer. Check for intermittent EGR at idle. Check for plugged EGR filter.
Check ignition timing. Check in-line fuel filter and replace if necessary. Check fuel pressure using CHART A-7 in appropriate article in COMPUTERIZED ENGINE CONTROL section.
Check O2 sensor for silicone contamination from fuel or use of improper RTV sealant. The O2 sensor may have White, powdery coating resulting in high but false signal voltage (rich exhaust indication). This will cause ECM to reduce fuel delivery to engine, causing surging problem.