Question about 1995 Pontiac Sunfire

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Missing problem... we replaced the fuel injector today and changed the plugs and wires the reason we changed the fuel injector is because it was leaking. now we have idle issues. it will start but idles hard also stalls when comming to a stop..also i noticed it is smoking around the uostreanm oxygen sensor can that be because its idle wrong. help me i have a 1995 Pontiac sunfire 2.2 engine

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It's missing, but I've changed the plugs, and wires, and the fuel filter?


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