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Hello I'm Neal and I am here to help resolve your issue. If I cannot help I will opt out and refer your question to another expert.
Have you replaced the o2 sensor? Have you made sure the catalytic converter is not the problem?
hi, my name is XXXXX XXXXX I will try to help you .
since you have done all that ,I dont see a mention of a tps sensor or egr valve.
try this first see if the egr valve is stuck open and check to make sure that there is no vacuum going to the valve at idle .
if that is good
then unplug the tps sensor on the throttlebody and see if that makes a difference.
these are about the only things that would make it run rich ,besides perhaps a big vacuum leak ...jazzmaster...
did you check for a vacuum leak?
also can you take off the vacuum to the fuel regulator and see if it is wet from fuel or fuel coming out of the pressure regulator?
wow ,that is weird let me think about this and I will get back to you very soon .jazzmaster ...
I am going to research this and I seem to remember having a vehicle like this awhile back ,be bcak soon
I am thinking perhaps the map sensor or circuit .
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
The manifold absolute pressure (MAP) sensor monitors pressure changes within the intake manifold which are the direct result of engine load, speed, and barometric pressure. As pressure in the intake manifold increases, additional fuel is required. The MAP sensor sends this information to the ECU/ECM so that the length of time the injectors are energized is increased or decreased accordingly.
The sensor is mounted within the electronic control unit. A manifold pressure line is routed with the engine harness and is connected to the front of the throttle body at one end to the MAP sensor at the other end. .
check to make sure that the vacuum line to the sensor is not broke or not getting vacuum to the sensor
you have checked and done just about everything else ,this is the only other thing that would give you the issue you are having and makes sense ...jazzmaster...