vacuum plugs man. vsv valve im not so sure on. u might get hassled a bit for egr delete, but in my experience, everytime i deleted the egr system (on my 84 crx, 93 altima, 84-89-91-91 camaro's, 87 toyota pickup etc...) i gained mileage and power. biggest gain was the altima. went from 26 mpg to 30 mpg, then up to 34 after i installed a CAI, header, exhaust and jim wolf ecu tune.
anyway, vacuum plugs are dirt cheap at any chain auto store, for an assorted pack its like 2-3 bucks.
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87 toyota 4x4 single cab short box pickup, 7MGZE.
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