subaru 2.2 misses at engine speeds below 1500 rpm what could cause this

2001 SUBARU IMPREZA
235,000 MILES
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RCDAV
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just installed new timing belt and idlers-new plugs-- had miss at idle befor any of this work was done and no change was made
Nov 20, 2011 at 3:46 AM
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KHLOW2008
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Is the Malfunction Indicator Light showing?

There are many possible causes for misfiring and the most common would be ignition related.
Were the spark plug wires checked?
Nov 20, 2011 at 4:15 AM