I have cleaned TB, IAC, replaced ECT, changed plugs and wires. Plugged the EGR vac line, tested EGR valve with pump to make sure working. I have changed the 2 cats, replaced the upstream O2 sensor, smoke tested. If the car goes into closed loop it will randomly stumble idling and usually stall. Only if RPM below say 900rpm. Just stared out of the blue.
If I unplug the o2 sensor it seems to run fine as I assume it is in a open loop at that point. Also same with MAP sensor. If I plug back in, while it is warmed up, I am assuming it goes to closed loop and then it will stumble and die. Intermitently but usualy within a few minutes of idling.
Of course there are no codes yet. Just checking to see if anyone has any ideas. I am going to replace MAP sensor (junkyard part just in case), I plan on replacing Camshaft Position Sensor and testing fuel pressure.
It always starts right up after it dies, without any issue at all.
Any help would be great, have been trying to narrow this down. I have followed many other threads on other forums and the end result is the owner just sells the car, ha.
It has 175k on it, I bought from a private party and have records of service, it was pretty well maintained.
Any help would be great.
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