Code 42

I have a 1994 Astro, and this code keeps coming up. The van runs like crap. They say it usually is the ignition control module, so i changed it, but
the problem didn't go away. Is it possible that the ECM needs to be replaced, or the timing chain needs replacing? Thx
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Go to batauto.com do a search for code 42, can be a complicated diagnosis

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