Excessive HC & Co

WARNING: This page is about a different car, the 1995 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

Check for gasoline in oil.
Check for leaky fuel injectors.
Check for faulty oxygen sensor.
Check ignition and sensor wires for poor connection.
Check crankshaft position sensor.
Check TP sensor and connector (if applicable).
Check for vacuum leaks.