Chevrolet Repair: 93 chevy blazer, chevy blazer, oxygen sensors

Question
My girl and I have been having issues with her 93 chevy blazer. It lags in acceleration and has been for the pastr few months. We figured it was a fuel problem so we had teh fuel pump changed. That did not solve the issue. Today, it lags bad when accelerating. Has a hard time getting past 12 mph. When I let off the gas and lightly press down again, there is a popping sound. Cannot generalize where the sound is coming from as we are driving.

Answer
HI DENNIS,WELL, THIS IS A TOUGH QUESTION BECAUSE I AM NOT THERE TO WITNESS THE PROBLEM.I GOT SOME IDEA'S.. I WOULD LIKE YOU TO REMOVE THE OXYGEN SENSORS FROM EACH SIDE OF THE EXHAUST MANIFOLD'S,YES IT WILL BE LOUD, HOWEVER SEE HOW IT RUNS LIKE THIS.IF IT RUNS WITH ALOT MORE POWER YOU HAVE A RESTRICTED  EXHAUST SYSTEM. SUCH AS A PLUGGED CONVERTOR. TRY THIS FIRST. THE POPPING SOUND BOTHERS ME A BIT BECAUSE IT SOUNDS LIKE THE VALVES ARE NOT OPENING AT THE RATE THEY SHOULD BE. LIKE A BAD OR SEVERAL BAD LIFTERS OR A BAD CAMSHAFT !!THIS HOWEVER IS RARE ON THIS TYPE OF ENGINE. HOWEVER THIS COULD BE JUST FROM A PLUGGED CONVERTOR. ALOT OF BUILT UP FUEL IN THE SYSTEM WILL CAUSE THIS AS WELL.THE OTHER POSSIBLE PROBLEM COULD BE A JUMPED TIMING CHAIN. SENDING THE TIMING INTO OUTER LIMITS. DO YOU HAVE A TIMING LIGHT ?? IF YOU CAN GET BACK TO ME WITH MORE INFO, IT MAY HELP ME TO DIAGNOSE FURTHER. PLEASE, WHEN YOU LEAVE THIS SITE COULD YOU PLEASE RATE THIS ANSWER. THIS WILL HELP ME..THANK YOU TOM..