Stop the engine!!!
For the 98-02 model, this problem can be cured by removing the air intake hose from the throttlebody. Then hold open the throttle plate and spray throttlebody cleaner on the plate. Use a toothbrush to dislodge the black goop and wipe clean with a rag. Repeat above until clean.
Use as little cleaner as possible as it tends to flood the engine upon the first start after this procedure. Also, don't use carburator cleaner, it's much to strong for a fuel injection system.
BTW, don't brush your teeth again with this brush. LOL
This problem has been noticed by many 6th gen owners upon starting their car for the first time of the day and also if it has sat long enough to cool down between starts.
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Honda XR600
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Ford XA Falcon specifications