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If you are sure you have a spark to at least half of the plugs, and there is no reason to suspect that the engine was being used abnormally just before it was shut down then it is most likely flooded or you ran out of gas.
Black smoke from the tailpipe indicates that the engine is getting a fuel mixture abnormally high in fuel (flooding). White smoke generally indicates not enough fuel.
Unless your engine is damaged or the timing changed, your engine will run if it has the following: proper fuel mixture, air, a spark to at least half of the spark plugs, and compression.
For a "flooded" engine there are two routes. Wait until the excess fuel has had time to dissipate or hold the accelerator to the floor while attempting to start. Be prepared to let off the accelerator about halfway as soon as it starts. And then down to about 1500 rpm. You do not want to over rev the engine. But holding it at about 1500 rpms for about 3-5 seconds will help flush out any excess fuel. You can then slowly return it to idle speed.
I'm assuming it won't start now with the new battery.. they do sometimes flood, but not usually unless there's a regulator problem, etc.. but try starting fluid into intake 1st. If it starts and runs, then proceed.. You'll have to start by checking if the fuel pump is running with key to ON 1st and foremost. the power to pump. If so, then check for fuel pressure then power to spark/coil, etc.. then spark then other.. even Temp sensor switch...(check wiring diagram in Haynes repair manual) too much to check from there on if no start still
I'm not an expert, just tryin to help from much experience with Chevys
Sounds like it is either your tps or air idle control.
You dont say if you have a check engine lite on.
If lite is on it will be easy to find with a scanner.
This is a fairly common problem..
Hope I was of some help.......
Test the fuel pressure. Also run some really good cleaaner ( like Techron ) through the sysytem. If you have good fuel pressure, have the regulator tested. Hope this helps;