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My 2003 ZX2 will flash the check engine light and set multiple misfire codes, Po301, P0302, P0303, P0304. Car had 156k miles, runs great, smooth at all rpms, gets 35+ mpg on the highway. This only happens at 2500 rpm and above or about 63 mph! Have replaced coil pack, plugs, wires, timing belt. Help ! Need to pass emissions test ! I am in Aurora IL