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So I have a weird issue with my 2008 Silverado 5.3. I had a p0327 code so swapped the knock sensor and seemed to fix it for a week or so. However it came back and the loss of power came back too. It seems to bog down like it’s not getting fuel or starving for air but the acts normal it is all intermittent and I have checked wires and plugs for everything. What else could it be. I have chased it and chase it this all seemed to start shortly before I cleaned my throttle body and really picked up after.