Fiveohgirl...Rick91GT had good handle on those first three lines. The 4th goes to the other small fitting that comes off the back of the upper intake...the black, metal vacuum tree that has (2) small outlets and one 5/16" outlet? The other (3) as he said go to the EGR valve, and the other (2) go to the Thermactor system/air pump. Hard to explain...but hope it helps.
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92'GT, Keith Craft Racing 306 (10:1 CR), PRO-M 80mm MAF,65MM TB, Edelbrock U/L intake,
TFS-TW heads milled/ported, CompCams XE274HR (.555/.565" lift w/1.6 rockers), A-351 adjustable roller rockers, 30# injectors,
Kirban FPR w/external pump, BBK ceramic coated LT headers, BBK Short H-pipe w/cats, Bassani cat back, Centerforce DF clutch/T.O. bearing...MSD 6AL w/MSD distributor, Steeda Tri axe, aluminum D/S, 3.73's, w/Factory Five U/L control arms. Lakewood 50/50 shocks. Flaming River Manual
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