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Car stuttering at startup

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Wufei

Wufei

15+ Year Contributor
560
21
Sep 4, 2004
Los Angeles, California
Installed the Evo fuel pump and 550 injectors. Using S-AFC II to tune. At cold startup, the car will stutter a little. Is it just because of the bigger injectors or is it something w/the fuel pressure (leaky injector seal or something w/the fuel pump)?
 
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Tightened the big white ring on top of the fuel pump a bit more. Problem seems to be gone now.
 
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