2003 S-10

when I go to start my truck it cranks but will not start

Are there more symtoms than "cranks but will not start"? Unfortunately, that's a little too general to start giving you advice. What troubleshooting have you done? Spark, fuel, codes?

I preformed a on board computer test using the obd1 reader the results were all O's no codes came up. Then I did the fuek pump check.I heard the fuel pump come on and off when system was pressurized after that I took the plug wire off and put a known good plug into the boot cranked the engine over and got a yellow spark no blue, I also checked all the fuses and relays. ..don't know what else to check...