i just changed the injector to 24# injectors and when i started the car it reved up to 2500 RPM"S and ran fine but when it came down to idle it makes a popping sound inside the intake. I changed the sample tube to the right one so its not the MAF and i backed the fuel pressure down to 40 psi from what i had it had 46 psi. i need help do you know what would make the popping nosie