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Just an update, problem still exists. Drop the gas tank and drained it and filled it with new gas to eliminate the possibility of bad gas. Also cleaned the throttle body. I also disconnected the maf sensor plug but nothing happend, still misfiring hard. Is it possible that the new plugs after...

Hi guys, this is my first time to post, ive been reading a lot of threads but cant seem to find the exact answer im looking for. 07 tahoe Lt with 168000 kms in it. Car runs fine since then and made a tune up just last month. Changed the spark plugs(ngk), plug wires(acdelco) and an oil change...