a month ago, i replaced the fuel filter on my car with a purolater filter and it drove good after i replaced it for 2 days or so or like 30 miles. I was driving home from work and my split air pipe decided to pop off again for like the 3rd time and shortly after that popped off, i started to get really bad fuel pressure. The car goes nowhere when i hit the gas and the intake just roars really loud. Today, i replaced the spark plugs with cold plugs and i put in a NIPPON fuel filter i got from Mazdatrix, the fuel pressure is still bad and it wont rev over 7000 rpms. Whats wrong??