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I replaced the spark plugs and wires, ignition coils, MAF sensor, accelerator position sensor, air filter, O2 sensor. None of that made any difference. It coughs standing still at 4000 rpm. It coughs upon acceleration from a stop, cold or warm. It coughs at 1500 rpm at 60 mph if there is an...

The engine goes "rrrrrr-cough-rrrrrr-cough-cough-rrrrr" (with the rrrr as normal) upon acceleration, from a start or full speed (it isn't related to low or high RPM). It isn't related to cold or warm engine. Engine has 145K miles. The Check Engine code says knock sensor, which is accurate. I...