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After replacing my radiator I started with a distilled water/white vinegar mix, then three rounds of water flushes. On the water flushes I used the factory-preferred method and had some pretty interesting results. Before I explain what happened, let me tell you what did NOT happen:The engine did not overheat. The temp gauge didn't budge above normal at all after reaching operating temperature. I attribute this to massaging the radiator hoses a whole bunch before capping the system each time.The check engine lamp never came on. As in, not once. Not even a flicker.I did not change throttle position at all when the phenomena began, until noted in the video.It was repeatable enough to happen on three consecutive "burps." So, what did happen? About 6 or 7 minutes into my 10 minute burp procedure, I would lose control of the throttle. Mind you, this is a drive-by-cable throttle, and I hadn't changed the throttle position at all. When this happened the rpms would drop down to about 1,250, then up to 1,750 rpm and repeat until I either floored the throttle, or backed out and let the engine idle. What the hell is going on?