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If you have a manual tranny you have much greater choice of computer, but if you have an auto it's probably computer controlled and that means you need a specific 5.0 computer. Check your drivers door pillar for the tranny code, if it's E you have an E4OD.. the most common auto for the later trucks in this series.
well i had a code for egr vavle not opening so i replaced it and it changed nothing...it also misses at low rpms....every once in awile when i start it it will idle up higher then normal and the check engine light will flash... and sometimes it sputters when pulling out....the iac is new..the fuel pump and fuel lines are new...new cap rotor plugs and plug wires..and egr