Check the firing order. If you took all the plug wires off at the same time, then there is the problem. Back firing out of the intake is a sure sign the firing order is wrong.
SOURCE: 2002 chevy blazer fuel pump (4 door)
yes you have to drop the tank. you will also need a fuel line tool to unhook the fuel lines. before you drop the tank see if tou can reach and wiggle the electrical connection on the top of the tank. these pumps have a pigtail issue. please rate
SOURCE: cylinder 2 misfire on a 1998 chevy blazer
check your plug wires for tears and dont overlap them
SOURCE: I Have a 2002 blazer that starts but motor dies, surges when accelerating
If this engine is a VORTEC then you may have a problem with the internal fuel system. Under the top plenum there is a fuel reg and poppet valves that inject fuel into the cylinders. Sometimes the tubes that run fuel from the reg to the valves can leak and cause your problem. This cannot be found with pressure check because this occurrs after the reg. PS fuel mileage will go down. Let me know if this helps.Moe
SOURCE: 2002 chevy van 2500 when i turn key to start van
SOUND LIKE ELECTRICAL PROBLEM IN THE STARTER CIRCUIT.CHECK WIRING TO STARTER AND CHECK STARTER SOLENOID.
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