What kind of mods have you done? The FP at idle should be around 40, maybe more if you have stock injectors and some mods. The only mods I had on my car at one point were a full exhaust, cold air intake, and timing to 15 degrees. I was having the same problems you are having, mostly in 4th gear. I got a adjustable FP regulator, and it solved my problem. My advice would be to get an adjustable FP regulator.
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-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway
-1994 Ranger w/ 427cid windsor (daily beater)
check it out!
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