Hesitation at 37mph
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Freshman User
Joined: Jul 2001
Posts: 30
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From: TEXAS!!! AND PROUD OF IT!
Hesitation at 37mph
I have a 65 F100/360/C6. all new wires, plugs, coil but can't find the cause. runs good up to 37 and starts buckin like a horse. If I give it more gas or ease up, it smooths out. It is consistent.. any ideas? timing, carb (jets, squirters)? I have a Holley 650 on it..
Lead Driver
Joined: Aug 2003
Posts: 6,305
Likes: 18
From: Boulder Creek, Ca
Sounds like it's been given a complete tune up. Before jumping into the carb, probably would not hurt to check the float levels, making sure truck is level, pull the sight screws and the fuel should be level with the threads. Then suggest recheck timing and adjust the fuel mixture, either too lean, or rich can cause a hesitation, or flat spot, during excelleration. Imagine a small carbon particle could get lodged in fuel passage and a shot of carb cleaner probably would not hurt. Also, rec. replace on install fuel filter if already have not done so. Recently rebuilt Hly 1850 (4160) 4v, and if have not rebuilt before it's probably one of the simplist to do. Anyhow, had an urge to chime in and add my 
