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The engine sounds like misfiring air comming from the manifolds at reving 2000 rpm and will not go higher then 2500rpm. Took manifold off and backfire came from the second manifold hole from left to right. Car will not go more then 30 miles per hour because of missfires, will just putter at 30mph misfiring? Too many codes to mention (At Autozone), changed plugs and air filter. Check engine light on. Any help?