1997 Chevy Camaro loss coolant,engine knocks when cold

1997 CHEVROLET CAMARO
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DGARZA691
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Engine Performance problem
1997 Chevy Camaro 6 cyl Automatic 147000 miles

Hi I own a 1997 chevy camaro 3.8,recently I have been loosing coolant and the engine is knocking at cold start only,I also had a code pop up saying missfire cylinder four , so i went ahead and replaced the plugs and wires,water pump,thermostat,flushed the system and still the engine knoecks when cold and still losing coolant ,please help me
Oct 31, 2008 at 10:23 PM
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DOCFIXIT
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Ever notice white smoke from tailpipe in A.M. startup?
If yes coolant leaking into cyl #4 headgasket or head
Nov 1, 2008 at 2:44 PM
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DGARZA691
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[quote:7d58f67cee="Docfixit"]Ever notice white smoke from tailpipe in A.M. startup?
If yes coolant leaking into cyl #4 headgasket or head[/quote:7d58f67cee] yes i do have white smoke in the morning time,so what is exactly the problem and how expensive can something like this run
Nov 1, 2008 at 7:42 PM
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DOCFIXIT
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Need to pull heads check for crackes plane and replace with new gaskets With milage would reccomend valve job. If you have it done @$1000 to $ 1400
Nov 2, 2008 at 4:13 PM