sounds like its about to go on you, at least it is warnign you ahead of tiem, alot of times the engine doesnt warn you, it will jusst break on you, the bearings spin, and usually break a rod, lots of screeching and sqealing and engine bogging down until it locks up, how it usually happens, or sometimes youll have rod knock, IE a warning.. sometimes.. ive had it happen both ways to me, so..
good luck
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