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Egr
Yes , it may be a vacumn issue , it could be a dirty throttle body which could result in a stopped up vacumn port , could be vacumn line has trash in it (blow them out with rubber safe cleaner or air) or could be one of many vacumn switches , temp controlled electrical switch or if you have the Temp Sensor (kinda like an O2 sensor) then that could be bad and not telling ECM that EGR is open , use the manual and find the system you have and then you can troubleshoot controls  .
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Guy
'91 ExCab Dlx Longbed/3VZE-Fast/Stock 2WD/5spd Manual
'95 GMC Jimmy SLS 4WD/4.3L Vortech/Euro Susp and Motor Package/Tow Package
F.A.I.T.H.
Forsaking All I Trust HIM
Matthew 19,20 :
19 I say again unto you,that if two of you shall agree on earth as touching anything they shall ask,it shall be done for them of my Father which is in Heaven
20 For where two or three are gathered in my Name,there Am I in the Midst of them
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