Chrysler Repair: 94 3.5L: dies while coasting/stopping

Question
QUESTION: Hi,

I have a 94 Chrysler Concorde 3.5 - it has recently started shutting off when the RPM goes too low. It just started doing this a couple of days ago. The RPM seems to want to take a dip when coming to stops, slowing in traffic or turning corners. The problem got worse today with doing this every time I slowed to a stop. The car has been running rough as well when idling. Can you give me an idea of what could be causing the issue. If this is the idle control valve, the location of this part on the vehicle would be helpful.

Thanks,
Torie

ANSWER: Hi Torie,
The behavior you describe sounds to me like you have an exhaust gas recirculation valve (egr) which is gummed up such that the valve stem is sticking slightly ajar rather than closing tightly when you take your foot off the gas pedal. If that happens the mixture becomes too lean to sustain an idle.
The valve is found by locating a small diameter exhaust pipe that branches off the exhaust manifold of the right side of the engine and goes toward the throttle body where it enters the egr valve. The valve is mounted horizontally under the throttle body. If you look closely at you will see between the round vacuum hose operated top piece and the valve body proper that there is a flange which if you peer inside of that you will see the valve stem which is a rod with circumferential slot. You can put the tip of a screwdriver in the slot and move the valve stem back and forth.
Use some WD-40 or similar thin lubricant to spray the stem where it enters the body of valve. Then work the stem back and forth to free-up the action of the stem.
I think that will solve this problem.
Please read the PS (below) and respond to it.
Thanks,
Roland

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QUESTION: Hi Roland,

That did not solve the problem- unfortunately when it first drove after doing this it worked ok but then it began stalling after about 10 minutes of driving.

Thanks,

Torie

ANSWER: Hi Torie,
If you noticed an improvement then that suggests that either it still is gummed up and you might do well to try the squirt of WD-40 followed by further exercising of the valve stem with the tip or a screwdriver in the slot OR if that doesn't solve the problem I would suggest that you remove the valve and clean it out from inside. It has 20 years worth of crud so it may take some further effort one way or the other to eliminate this sticking of the valve agar and thus leaking when it needs to be closed tightly to have a proper mixture for idling of the engine.
Please consider using the "thank/rate" tab below to rate my effort and if you believe I deserve it to nominate me for 'volunteer of the month'.
Thanks,
Roland

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QUESTION: Hi Roland,

I should have let you know the egr valve is only about 4 months old. The sticking is not an issue anymore and i cleaned the part out before using the lubricant.

Thanks,

Torie

Answer
Hi Torie,
Let's go back to basics then and do a fault code readout. Turn the ignition key: "on-off-on-off-on and leave on" doing that in 5 seconds or less elapsed time. Then watch the 'check engine' light, which remains 'on', to see it begin to flash, pause, flash, etc. Count the number of flashes before each pause. Then repeat the process to be sure of an accurate set of flash counts.
Tell me the counts in order of appearance and we'll go from there. The engine controller may tell us what is causing this problem.
Please do a thank/rate of me.
Roland