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Q: My car is riding rough after I changed plugs and coils oh no check engine light on 2003 Mercury Grand Marquis

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I had the intake manifold replaced it was cracked 2 months later check engine light came on car misfiring started with cl 8 so went through and changed all coils and plugs. found water in cl 5 blew it out changed that too now its a little better but still rough on acceleration oh cleaned MAS what am I missing?
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