You should go to Autozone or somewhere to get the codes read and then post them here. That would help. From what you are saying though, it sounds like the fuel pump to me....or the filter. I assume since you posted "cam sensor" in the singular that this is a Zetec. Describe the noise.

'99 Sport TropicGreen,Duratec, SVT exhaust, Brembo rotors, Ceramic pads, K&N filters(oil & air), Alpine CDM7874, Polk DB570 speakers front and rear. Fog light mod. 50% Formula One tint.