Chrysler Repair: 93 3.3L T&C: engine dies at idle, lean mixture, exhaust gases

Question
van dies intermitently at idle and sometimes misses a beat while moving,will start up again. new ign switch new asd relay. no codes on scanner. 3.3l engine

Answer
Die without codes is always challenging. I would take a look at the egr valve which may be gummed up with exhaust waste products such that the valve stem is not moving freely enough to close to a dead stop which it must do at idle or the engine will die due to too lean a mixture.  The valve is located near the throttle body air intake at the end of the engine, mounted in pipe that recirculates exhaust gas from the rear cylider bank exhaust pipe back around to the intake manifold. The exhaust gases have some fumes that can plate out a crud on the valve stem and thus keep it from closing tight when you are at idle. That makes for a too lean mixture so the engine stalls. The valve proper is mounted horizontally with the stem visible in a space between the body of the valve mounted on the pipe and the round top of the valve which is flanged and so if you look carefully you will see a metal rod (stem of the valve) with a slot around its circumference. You can take the tip of flat blade screwdriver and insert it in the slot and then lever the valve back and forth to check if it is moving freely (against spring action in one direction) or not. If it doesn't seem to close easily with the help of the built-in spring, then I would spray the base of the stem with solvent from a pressure can (such as WD-40 or carb cleaner) while moving the stem back and forth.  Then see if that solves the issue.
Of course when you say no codes, you would want to have read them with an OBD-I type reader. Have you tried using the ignition key? "on-off-on-off on and leave on" doing that in 5 seconds or less elapsed time. Then count the number of flashes before each pause shown by the check engine light. Then repeat to assure an accurate set of flash counts. Then write back and tell me the flash counts in order of appearance.
Roland