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Question by temper: changed intake manifold on a 97 cougar fuel injection!?
engine knocks,shakes,misses,and was hard to start after changing the manifold.the engine ran beautiful prior to me doing it.v8 4.6 plastic manifold…people told me the only thing critical to changing this manifold was the torque specks..i followed those,but it seems like 1 of my ejectors or spark plug wires are crossed? but its not popping or spitting back.can someone pls tell me what the problem is or seems like to you? ty

Best answer:

Answer by Michael B
Whether plastic or metal, the intake could have a crack in it, the gaskets may not be sealing, you missed a vacuum hose, etc.

With no back fire, the firing order may be ok, so investigate serious vacuum leaks first.

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