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The first thing that needs to be done is to read the codes in the computer that is causing check engine light to come on. This is most likely related to running rough. There a many things that can cause this problem, so instead of guessing as to problem and throwing parts and money at it, read the computer and go from there.
Here are directions on how to pull the codes yourself and what they mean:
To extract DTCs from the computer for diagnostic purposes, the Self Test connector is used. The DLC is located below the instument panel to the right of the steering wheel.
Data Link Connector (DLC)(Located Underhood)
Analog Voltmeter Connection
Once you have the codes, check with the chart to see what it means. If you have a further question on replacing a specific part or further testing, just re-open this question and I will continue to help you until fixed at no addtional charge.
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