ok i just finished my intercooler..piping and everything..now my car spits out black smoke..my friend says in between shifts is when i spit black smoke out the exhuast..and im shifting at 2,000rpm..also my car dies sometimes..and bogs as well..like it not getting enough air..maybe some pipes are loose? my friend said he had to tune his rx7 after he put his intercooler in..need help