intermitent check engine light

2000 Rodeo, with 4 cyl engine, 130,000 miles, no issues, reggular maint performed, last 100 mile check engine light comes on after laying a smoke screen out the back, then drives fine for a day or so and then does the same thing. SHop syas nothing wrong, gas milage is the pits, any ideas? Thanks
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JMC
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