390 Hesitation
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Senior User
Joined: Oct 2003
Posts: 109
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390 Hesitation
I have 390 in my truck right now with a holley 670 w/30cc accelerator pump. When i hit the gas from idle it stumbles then takes off, I'm pretty sure its the accel. pump should I up it to the 50cc pump or just change the pump cam.
Elder User
Joined: May 2004
Posts: 565
Likes: 3
From: saxton pa.
Stumble
First thing you want to do is check the accelerator pump linkage. It should start to move the pump arm as soon as the throttle is moved. With the engine off look down in the primary side @ open the throttle you should get a good stream from the squirters, check to make sure both sides get equal flow. If you dont get fuel as soon as you move the throttle you will need to adjust the pump arm.
GOOD LUCK HOTWRENCH
GOOD LUCK HOTWRENCH
