Most places like auto stores and Meijers/ Wal-Mart carry good code readers from Actron. The CP9135 should run around $100 even and comes with a CD containing thousands of codes you can read and study, The tool itself gives you a DTC and what part is malfuctioning. Here is a link to Actron's web page for the CP9135. http://actron.com/product_detail.php?pid=16151 I hope this helps. 
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1998 Chevy K1500 Standard Cab, Flareside Cargo Box,
All Options, 5.0L V8, 4L60E -K&N Filter, Custom Exhaust, American Racing Rims, Manik Brushguard, CF Light Shades, Glasscapes picture, More to Come! 
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