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Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
Do you have the ability to scan it to see which code it stores?
When this happens is there exhaust smoke?
Are you running a power programmer on your vehicle? I ask because they can make the computer forget trouble codes.
Since there are no codes stored but a warning light is on, this means the PCM is the most likely failure in this case. Other possible causes would be:
You may want to duplicate this and scan it prior to shitting it off while the light is still on.
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Hello again Chris here,