I have a Mazda 6 with 3.0 liter engine. Engine light came on week ago checked with code reader it goes up P0171 and P0174. Took off MAF sensor clean it clear code. When I drive over an hour engine light comes back on with same code. Let car sit at least 8 hours engine light turns off. Drive it for an hour engine light turns back on. Car runs fine no problems with performance of car. Need up with this problem.
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