"service engine soon" light on... '98 Blazer

My '98 S-10 Blazer has been sitting for a while. Now it's running rough and the "service engine soon" light comes on. I replaced one O2 sensor, disconnected the battery then reconnected the battery with no luck. So, I took the O2 sensor I removed and used it to replace the sensor on the other side. THe light went off for a few minutes then came on again after a few miles of driving. I'm about to buy another O2 sensor: what else should I try?

Thanks

Get the codes checked before you buy anything.That way you won't waste money trying to find a needle in a haystack.

Get the codes checked before you buy anything.That way you won't waste money trying to find a needle in a haystack.
Good Idea!

have a 1999 that will crank but not start no fire help

have a 1999 that will crank but not start no fire help


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