Engine Surges

Check spark plugs.
Check fuel pressure.
Check for vacuum leaks.
Check for cracked distributor cap or rotor.
Check ignition and valve timing.
Check for clogged fuel filter.
Check for faulty ECM.
Check for malfunctioning electronic fuel injection system.
Check for malfunctioning EGR valve (if equipped).
Check for malfunctioning distributor mechanical and vacuum advance (if equipped).
Ensure sufficient secondary spark is available.