i just heat wrapped my manifold, and my manifold gasket was barly there...
i would start with where manifold reaches exhaust.
also its only like a 1.5$ / foot of the vacuum lines if you think its egr, just buy 10 ft and start 1 vacuum line at a time i replaced every line on mine just because i could for under 30 dollers (it took about 26 feet for my 84 5m-ge)
also i have seen these manifolds crack, check for cracks and make sure the heat shield studs are all tight, because they go strait through to the inside of the manifold
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1984 supra - 1uzfe - w58 - 4.10 - 1 piece aluminum shaft.
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