a low howling/humming noise occasionally, the noise stops if I accelerate

What is your question?

was rarely but, recently had intake manifold, coolant pipe and radiator replaced. Noise occurs more often now. Noise seems to come from the driver's side of the engine, is a deep waaaaaaaa sound. it never made engine light come on.

What makes this problem better or worse?

noise goes away if I tap gas pedal

How long has your 2002 Ford Crown Victoria had this problem?

worse in past 2 weeks