Throttle Body Shop TBS 10323 GM TBI OEM 12 Psi"BLACK" Fuel Pressure Spring TBI 12psi OEM "BLACK" fuel regulator replacement spring Fits: 1986-95 2.8L 4.3L 5.0L 5.7L 7.4L TBI motors Newly remanufactured spring for stock TBI motors with fuel pressure from 11-12psi Springs are cleaned and rate (stiffness) verified to match OEM specs Silverado Sierra Suburban Yukon Blazer Camaro Firebird Caprice S10 Jimmy 2nd photo shows typical TBI injector assembly these fit