I have a 2005 Toyota Echo, I have a fluttering or hesitation in the engine when

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I have a 2005 Toyota Echo, I have a fluttering or hesitation in the engine when I accelerate, the check engine light comes on and the code says it's a misfire on whatever cylinder, I've changed out the coil packs, installed new plugs, changed the mass air flow sensor and still the fluttering/hesitation remains. Before I changed the coil packs and the air flow sensor she would cut down on her idle so low she would shut off…. It's gotten better since the new parts but the fluttering/hesitation is still there….. CAN ANYONE HELP???? Thanks Group!

What makes this problem better or worse?

N/A

How long has your 2005 Toyota Echo had this problem?

Weeks