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i know that the vortec 4.3 had issues with the egr valve and gassing up the engine and backfiring! i bought a 94 gmc jimmy with the 4.3 for 800.00 and 70,000 miles! the owner said that the mechanic said the engine was junk! well after new egr valve the truck was bought from my boss and now has 195,000 mile on it! he also has had the egr valve replaced twice !
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