New injectors can be a bit noisy. It takes them a 100 miles or so to settle into their normal working. My 240 was extra noisy after I put in the injectors, but soon what quite and smooth as a baby's bum.
But I'd call the shop and verify what they set the pop pressure and they set the pop pressure.
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Andrew '04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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