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97 Camry misfire
My 97 Camry 2.2 has 155,000 miles. Runs and idles superb!! Gas mileage is 26 in city running A/C. Check engine light flashes ONLY if I am climbing long hill on interstate at speeds 70mph or above. Even then the engine is steady and I feel nothing of a misfire. I have installed NGK Iridiums and NGK wires and a new coil for Cyl. 1&4 trying to solve this. The code is always 300,301 & 304. If I reset with my OBDII scanner and stay off interstate everything is ok. If I get back on interstate and climb long hill, flashing light with codes 300,301 &304. Crazy thing is car performs great, You can not feel any misfire even when light is flashing. Any ideas???
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