My car emits a fuel smell (can smell it when idling, at red lights etc.) I thought it was somehow from my POS stock exhaust but I've since replaced it w/complete exhaust sytem hdrs,o/r h pipe and flows, new injectors, plugs (old ones were white on tips), plug wires and fuel filter. But it still smells the same? I have checked for any leaks=none. Could this be because I removed the smog pump or bad o2 sensors or a combination of both?