Engine check light comes on after a couple days it goes out but the Van plug wir

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and the coil it seemed to help but did not totally I drove 250 miles before it misfired and light came on then I did the reading again it showed P1174 trim fuel cylinder each time I drove another 65 miles and light came back on with a slight mis firing when I give it gas but then mis fire stopps after I level out around 65 miles per hour