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EGR valve
My '96 Cirrus was doing something very much like this. It preferred not to idle! It got so bad it wouldn't idle at all. My mechanic diagnosed the problem as the EGR valve being stuck open. When I called him, he told me, "Two foot it in here and we'll take a look at it." Get it? That's what I had to do: at stop lights, keep the brake and accelerator pressed simultaneously. We replaced the EGR valve with a new Mopar unit and the problem went away. Prior to that I had replaced the idle speed motor and the throttle position sensor, maybe for another issue. In any case, it was the EGR valve that was the silver bullet.
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