i have a hissing/whiring noise from the inlet manifold area off my engine when the car is ticking over i thought it was the aux belt pulley's so i changed them the noise is still there can anyone shine some light on this noise is it normal or is there something not right,and some times the idle is a bit lumpy

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yeah the zx td is back on the road front mounted intercooler fitted fuel pump tweaks now required + turbo adjustment