If you are not getting any error codes, it is time for a major tune up, plugs, fuel filter, air filter, oil change, filter.
Check plug boots for cracking and connections to coil pack.
Use recommended plugs that came from factory, usually platinum or iridium.
Here's some reference, although some does not apply to Ecotech engine.
https://www.2carpros.com/how_to/how_to_tune_up.htm
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Saturday, February 21st, 2009 AT 8:50 AM