Chrysler Repair: Stalling problem: 3.0L V-6, chrysler lebaron convertible, 1990 chrysler lebaron

Question
Roland,
I have a 1990 Chrysler LeBaron Convertible that stalls constantly. I can be going 70 down the interstate and it will stall going 30 or sitting at idle. I had a complete tuneup including replacing the wires and distributor cap, I replaced the fuel filter, removed the throttle body and cleaned it (in and out). I have no error codes, it just flashes five twice. It starts right after it stalls almost always but once in a while it takes a little longer. It idles at about 750 RPM and runs fine when not stalling.

Answer
Hi Dan,
Check the egr valve 'action' to make sure that it isn't sticking ajar. It is located in the pipe that starts at the exhaust manifold on the side of the engine closer to the front of the car, runs around the rear of the engine, where you will find it bolted into the pipe. There is a flange between the round top and the body of the valve proper. Inside the flange you will find the valve stem which has a slot into which the tip of a screwdriver can be inserted to allow you to move the stem back and forth, against spring-action in one direction that closes the valve. Make sure that the spring closes the valve to a dead stop. If not, spray some WD-40 on the stem where it enter the valve body and 'exercise' the stem some more. Other than that, keep checking for fault codes because a component may be failing but not reached the threshold to set a code.
Roland
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Roland, Is the EGR Valve installed in all cars or is it only in cars manufactured in California?

Hi Dan,
Your are correct in raising that issue. I was thinking we were dealing with a '94-5 for some unknown reasons; indeed the '90 3.0L only had the egr in the CA sold vehicles (which is where I live, so that might explain my oversight). I thought of one other possibility: a faulty ignition switch. You might try jiggling it while you are running the engine to see if you can make it cut off. Thanks for the nomination and evaluation!