My TBI 350 has 167K on it right now, and many times under acceleration i get some strange noises from the engine, sounds like something is loose in there...every time this happens the SES light comes on with a code 43...something wrong with ESC circuit. I've determined that nothing is wrong with the ESC system though, and i think its something internal inside the engine, and maybe the knock is too mcuh for the knock sensor to retard the timing, so it just sets off the SES light. Someone else on here had the same problem too, dont remember who though. Anyway, cant i pull the oil pan and checek the beairngs to see if there is a lot of play in them, possible causing this? How much are bearings? I'd like this engine to last a while longer but with this many miles i know its time is coming...would repalcing these even be worth it?