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Engine hunting at idle
I have an 89 corsica with a 2.8 engine. Yesterday my wife tried to start it and the battery literally exploded. It got acid in the area of the battery, but nothing too severe. I put baking soda on the acid and rinsed it off with water. I put a new battery in and checked voltage with it running. It was normal at about 14.4 volts, so I can only assume that it was a bad battery.
Now, since I replaced the battery, at idle it hunts...goes up to about 1300rpm and down to about 400. If I'm lucky it doesn't die, but it usually does. I have tried cleaning the IAC valve, which did not help at all. Also, I tried disconnecting the battery and resetting the computer. After I reset it, I started the engine and let it idle about 5 min. It did good for the first couple of minutes, then it started hunting again. After a couple of cycles of hunting, it would die. When it died, it would not restart without me giving it a little gas. I have checked for codes and none show.
Any help would be greatly appreciated.
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