1997 Chevrolet G Series Van (G20) Questions

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Van starts up and runs fine when cold. Sea light stays on. Once truck is up to speed it runs fine. When I give it gas it has a misfire. Temp needle doesn't move above 100.
there is no spark or no fule getting to enfine i checkedf the fule
only coode is a p0143, van started running like this after belt tensioner broke and lost power fixed the belt tensioner and sinse then van runs bad. i have good fuel pressure and it is holding, also have good compresion, and coil cap rotor good but front two cylinders acting up. any ideas.
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