My 96 chevy tahoe 4dr lt with a 5.7 liter vortec and auto tranny. Is there any way that I can run a computer diagnostics on this car myself to find the code it is throwing and if so is there a website to tell me what the codes stand for i.e. code 16 equals egr, or something? The cheapest place around here that I have found for simply a scan is 90 bucks? Any suggestions/