I just installed a cold air intake and now my car is starting to shake and misfire. I cleaned out the throttle body and maf sensor. I upgraded my fuel to 93 octane. I noticed the o2 sensors were ripped out and the previous owner had straight piped the exhaust by executing the catalytic converter. The car has always had trouble catching air flow but never on cold idle. Never this rough. It catches good after 3rd 4th and 5th but take off is horrible. If I don't let it warm up before leaving it shuts off the motor. It pops and back fires. I'm thinking about putting in a performance chip but idk how to fix the problem at hand I'm lost