hello all new here i recently bought a 93 s-10 blazer 2wd with 4.3 w engine code i have a bad misfire and backfire i replaced all plugs and wires with new a/c delco plugs and cap and rotor button i cleaned my iac valve and egr valve with carb cleaner i havent yet removed the imtv to see if spyder problem exist i am in time and have 125-135 psi on all cylinders the vehicle cranks and runs also i unplugged the imtv while running and nothing changed and my ses light didnt come own is this normal and which relay on d/side firewall is the right one i have 2 sorry to be so long winded but ive never owned a smaller v/6 vehicle thanks for any assistance

 

Have AutoZone, Advance Auto, etc test your ignition coil.

 

alright i will do that tomorrow thanks,