1996 Ford Probe GT RPM issues?

I have a 96 Probe GT that is constantly acting like it wants to cut out at low rpms. When the check engine light is off, the car idles at around 1,200 rpm (warm engine). With the engine warm, the car will buck and spudder at low rpms when setting off from a stop or idling. The check engine light will flash for a split second when this happens. Once the car is in third gear and the engine spins at right around 2,000rpm, everything works fine. HOWEVER the car will sometimes start with the check engine light on and it will sometimes stay on. When this happens the car doesn't experience any of the bucking or spuddering at all. I've cleaned out the air filter, changed the spark plugs, and I've had the crankshaft position sensor replaced.
Thanks for the help

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