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check engine light ???

561 2
Today as i was going to town my cel came on, pulled over, turned the truck off, turned the key to run position pulled dtc on my outlook and no code was present, went ahead and cleared dtc's and now the light is off, what the crap,this is like the third time this has happened, i put a ts shift master in last week and it seems to be doing fine, any chance that the shift master caused the cel to come on. i also pulled my boost fooler off thinking that it might have caused the cel also. does anyone have any ideas as to what may be going on???? Thanks