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95 astro rough idle

I have a 95 astro with 354K miles. It idles rough, but seem to be ok when you are driving. I have replaced the O2 sensor, the MAP sensor. There is a smell of fuel when it is idling. the gas mileage has gone from 20 miles per gallon to around 17. I took it to the shop and they were the ones that change the MAP sensor. That helped about 80 % of the problem. Now they tell me it is probably the injectors and will cost around$800.00. Can anyone tell me if that sounds like the problem or is there something else to try first.

Thanks.............
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