misfiring problems codes p0300 and p0301

2003 VAUXHALL ZAFIRA
86,000 MILES
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11.NICOLA1
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Hi my vauxhall zafira 1.6 has misfiring problems codes p0300 and p0301 had it at garage coil pack x2 sparks plugs plus they say new ecu had it changed still same faults could you help please thanks

had at multiple garages no one seems to no what the problem is
Jan 28, 2012 at 10:32 AM
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MHPAUTOS
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both are misfire codes, check fuel injectors are working, you have good fuel pressure, no vacuum leaks, start here.
Jan 28, 2012 at 10:58 AM