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Q: knocking only at idle. on 1993 Buick Century

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my car ran really sluggesh when i first got her but after a lil T.L.C she ran great for just about 9500 miles (still doing all the right stuff) but now only 45 miles after new oil and plugs there is a loud knocking sound coming from the back side of the motor. any answers?or answer?
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Knocking sounds are never a good thing! Of course check the engine oil level. Is the knocking sound associated with a drop in performance (knock sensor can retard ignition timing if it senses knock or detonation). Is the engine starting to misfire or run poorly. Time to get things check engine out in case its oil starvation, compression check, cylinder leakage test ect...to check the "strength" of your engine.
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