I bet he means the line from the intake manifold to the firewall to the ALDA (boost sensor?). The banjo bolt going into the maniflod clogs and messes up the whole thing... you just take it out and clean it. It's on the very back of the manifold.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k