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Q: Multiple Engine Troubles on 2002 Hyundai Accent

Recently I had factory fog lights installed in my 2001 Hyundai Accent LC, 1.5L SOHC EFI 5-speed with 115, 297 original miles. Since then, it has been idling rough, occasionally misfiring cylinders 3 & 4. Also, (recently) it has been stalling after I have been driving for long periods (like on the freeway), but sometimes it just happens out of the blue. Also, when I try to ''hard'' accelerate (like in passing someone) or after I've been turning for a while (as in a from an exit ramp). These problems are also dramatically reducing my MPG from about 35 to 25!

I have talked with many different mechanics and have gotten many different responses as to what the problem may be. I am looking into changing the coil packs and spark plug wires now, and have replaced the battery and the spark plugs, but have not made any other changes yet. Also, I am trying to locate the computer, to see if that's where my problem lies...(to see if there is a burnt smell or water damage or just wear-and-tear) I use this car as a daily driver, and plan to continue to do as such. Suggestions?
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Why don;t you go the person that 'installed' the fog lights since that is where the trouble began, according to the beginning of your question. They may have tapped in to an ignition wiring harness for power and it is robbing your ignition system of the juice it needs to function. Fog Lights take LOTS of juice.
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