1999 Cadillac Catera

Engine Mechanical problem
1999 Cadillac Catera 6 cyl Front Wheel Drive Automatic 75000 miles

Hi, I have a problem, I so call myself trying to put in a timer chain on a 1999 Cadillac Catera and it has a 3.0 tween cam. Now I got it to start but it backfire on me so I turn it off right then and there because I didn't know if it was right or wrong. So please help, " Thanks"
January 21, 2010.

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