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Old 01-16-2013, 03:55 PM   #1
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Join Date: Jan 2013
Fan#: 108573
Location: Magalia, CA
What I Drive: 2005 sonic blue zx3

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2005 zx3 2.0 Duratec stutter/shudder

I have a 2005 zx3 2.0 duratec with 5sp. Car is stock with stealth CAI just modded to see if would help my issue. Car has 113000 miles and im the only owner. Lately the car has a very loud engine noise under load and acceleration. With that there is a stutter/flutter to the engine under load, at any speed. Mostly noticeable at highway speed with any throttle. noise and shudder subsides as soon as throttle is released. Have replaced the fuel filter and new autolite plugs gapped to .55. Coils all have 4 ohms resistance. Going to clean MAF tonight to see if it helps. I am stumped. Also...ECU was reset after new air filter and plugs installed and went for 120 mile highway drive to let the ECU relearn.

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