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Bad coils are just one of many things that could be to blame. I'd say stop changing coils. It is highly unlikely that they were the root cause of the problem to begin with. The symptoms provided are consistent with a misfiring engine. This usually means that there is an issue with the mixture of air and fuel reaching the engine (more on that in a bit). So ...
There appears to be a similar case on the Cobalt forum, where compression test figures are reported to be around 220 psi, roughly double what you're reporting. If this is the case for your vehicle, it would seem that the problem is related to a lack of compression and not fuel, air or spark.
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