2003 Volvo S40 runs rough

2003 VOLVO S40
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RUIZLIDOS
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Engine Performance problem
2003 Volvo S40 4 cyl Front Wheel Drive

the car was running a little rough when we bought it(used of course). Replaced timing belt, water pump, plugs, and intake manifold gasket. Ran great for about a month then started getting a really bad miss. Checked the plugs and two of them had shattered along the porcelain. Is this due to bad coil packs?
Jan 27, 2009 at 9:19 PM
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DOCFIXIT
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Sounds more like detonation ie. spark knock. Is a check engine light on? Maybe high combustion temps. Check EGR operation if not opening temps will rise. Also are there black spots on porcelian?
Jan 29, 2009 at 9:31 AM
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