my 2002 chevy blazer has 73000 miles on it when i go to start it when cold or hot it takes about 6 seconds or sometimes two trys to start then has a very small miss in it only when idleing or giving very little gas.the service engine lightis on and computerreads random misfire. i have gave it a full tune up plus replaced the fuel filter ignition coil andcolent temp sensor also had the fuel pressure regulator checked psi is 70 im low on moneyto keep buying new stuff.i have heard it might be the throttle pressure sensor but i dunnothanks ahead of time.oh i also bought it like this thinking it would be a easy fix so any ideas are very appreciated.

 

Dirty MAF sensor, carboned up EGR or IAC. Might be a dirty poppet valve sticking....try running Seafoam through tank, it might unstick the poppet valve, depending on the amount of carbon...

These items can be checked and fixed with a minimum of money...seafoam= $8-10. EGR cleaning cost of gasket, same for IAC cost of TB gasket if the old gasket becomes damaged...

 

Could you post the code# for your missfire?