Mystery vacuum line

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mtbadbob

Full Access Member
Joined
May 9, 2021
Posts
617
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918
Location
Montana
First Name
Bob
Truck Year
1987
Truck Model
V20
Engine Size
350
Should i bother with it then? I thought it may have something to do with my check engine code lean 44
I just plugged mine at the TBI. It may have something to do with the lean code. My check engine light pops on periodically but goes off by itself & seems kind of random. Have you checked or replaced your O2 sensor?
 

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