Spoonsinglecam

lately for about 3 days i been driving my car and as soon i startup the car it makes this boggin noise and sounds like its misfiring. i checked the timing and the spark plugs and the wires as well as the distributor.. i havent changed the distributor cap in a while could it be that? i checked the o2 sensors and theyre fine. i have a small hole in the flange of the pipe right after the 2nd o2 sensor connecting to the mid pipe... im jus wondering if theres any solutions for this. or could it be this small hole making this happen?