2003 Pontiac Grand Prix SE 3.1....has no power
have replaced EGR Valve...Down Stream O2 Sensor...Spark Plugs...Exhaust Header Gasket....and now has less power then before...engine runs
have replaced EGR Valve...Down Stream O2 Sensor...Spark Plugs...Exhaust Header Gasket....and now has less power then before...engine runs
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