Why is my engine sputtering?

1999 TOYOTA AVALON
150,000 MILES
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JBRAM1104
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Hello - I was on my way to work and, while sitting in traffic, my engine began to sputter. I turned around and went back home and it seemed to sputter some on acceleration, then when at a normal speed seemed ok, but sounded rough. When I turned the car off and opened the door, I smelled something that I've never smelled before - a borderline burning smell. Oil level is ok. It sputters more in Drive rather than in Park, but sputters in both gears. Most parts on the car are new, including the timing belt and water pump. Any ideas?
Jan 30, 2012 at 3:27 PM
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DOCFIXIT
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May have a missfire or injector fault. smell maybe unburnt fuel burning off in exhaust
Jan 30, 2012 at 6:12 PM
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JBRAM1104
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Thank you. Recently, I've noticed some shoddy radio reception which I have heard could be a result from a spark plug issue also. Could that also be an indicator?
Jan 30, 2012 at 6:55 PM
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DOCFIXIT
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Yes may have faulty plug wire
Jan 30, 2012 at 6:57 PM