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Re: Engine surging
Check for vacuum leaks from the intake manifold and surrounding hoses including the brake booster, also be sure that the EGR valve is working properly and it isn't stuck open. If the car is equipped with a vacuum reservoir make sure that it isn't cracked or broken including the air filter housing and the intake pipe. Check the mass air flow sensor with DVOM using the frequency scale, the mass airflow sometimes does not set any codes but it's a major culprit that causes major problems such as rough idle, stalling, stumble, and other symptoms. A quick check to see if the mass air flow is working is by starting the engine and using a screwdriver tap on it and watch the engine's reaction. If its bad you will notice a change in engine behavior instantly.
post back your findings.
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