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2003 Kia Rio Cinco 1.6
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I have a 2003 Rio Cinco. I was driving to work one day last week and she was running perfectly. Stopped at a red light, when the light went green I stepped on the gas and she started sputtering and died. When I start the engine it will run on all 4 cylinders, as soon as I put it in gear and put a load on the engine I lose cylinders 1 and 4. I replaced the coil pack about two months ago. When you start the engine it will run on all 4 and you can remove the coil pack connector for cylinders 1 and 4 and you will lose those 2 cylinders so we know initially all 4 are firing. With a meter I can confirm between 13.5 and 14 volts at the connector consistantly. Once a load has been put on the engine voltage becomes inconsistent, but still there. The connectors have been replaced by a previous owner and I had to redo their soldering job so I know that connection is good now. A friend thought maybe cam and/or crank position sensors but would that not affect all cylinders not just two?

Thank you in advance for any wisdom you might be able to impart.
 
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