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Thanks, Don!!!

You can hear it when slowing down, cruising at very slow speed and while stopped at red lights, etc.

Well, disconnecting the battery helped a little. However, there is still a knocking sound and the car idles like it's really straining. It runs smooth on the road, though. I took it to Autozone and it passed the diagnostics test with no codes returned at all. I've taken it to a couple of...

Thanks, that helped!!

I don't recall driving hard during this time (mostly around town). I should also say I believe I have a leaky valve gasket, also, as I do see dirty oil on/around the gasket covers. The check engine light has been coming on and off during this time (mostly staying on). Also, I'm still not sure...

Since I've owned my 2000 LS, I've burned premium gas 99.5% of the time. REcently, I put about a half a tank of regular in it. A few days later, I noticed a knocking noise in the engine. I've burned several tanks of premium since that, but, the knocking noise remains. Any ideas? Also, does...