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Discussion Starter · #1 ·
Fixing one issue at a time with my little ZC21 '08 1.5.

Manual says desired RPM is 700.
The car idles at 700 +/- 50 rpm which is fine according to manual.

In drive now. The car when in D and brakes held drops rpm slowly but steadily to about 630. And starts to give a slight shudder.


I just got my AC fixed and I use it a lot now. And I realized I noticed a misfire twice this morning at stop lights. Noticable feel of engine drop and then instant pick back up. About .5 second drop. Two separate occasions. Didn't get the exact rpm drop as I didn't have my scanner running at that time

Where should I start? I don't get any error codes.

And plugs, filters, oil etc changed in March.
 
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