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Discussion Starter · #1 ·
Whats up Focus Fanatics! I've got a question
Here's some helpful stats
2003 ZX3 Zetec 5spd
95,000 miles
just changed oil, spark plugs, and wires
running basically stock except for an CAI thats
been on there for 2 years with no probs.

What would be some good parts to check that would help solve this problem?
The engine seems to be stuttering and stumbling only while cruising (not during acceleration) and while running idle the engine drops a few rpms and stutters.
 

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You throwing a code? I had my 02 sensors go out and the car would stumble while cruising on the highway alot and my idle was off.
 
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