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Having the same problem with a 1998 Honda Accord, V-6, if you've got a trouble code then follow that trail, TPS (throttle positioning sensor), IAC (idle air control valve) and MAP sensor (mass air flow), will generally post a code to the ECM, if not then look for vaccum line leakage,(motor mount system may be vac operated and the lines can easily get loosened). The last possible suspect would be the O2 sensor, you've probably got 2 of them, the upper one(closest to the engine) tends to get more heat abuse. (Look for the simple fix first)

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Q: 97 Honda Accord lx fluctuating idle with cold engine?
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