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I have a Holley 4160 600cfm with vac secondaries and manual choke. It wont idle well and sputters slightly until you get up over 3,000....after that it runs tops. I have already taken off the front bowl and blown out all of the little crevices and valves and needles. I replaced the diaphram in the accelorator pump. It ran fine for a few minutes after I did this, but now it's going back to sputtering at the lower rpm's.
What could be wrong?
Also, I have a fuel pressure gauge (1 month old) right at the carb and when the motor is cold it's at 5-6 lbs. Once the engine gets hot, it drops to 0-1 lbs.....but here's the kicker...the car still runs fine with the lower fuel pressure reading. Even up to 4,500-5,000 rpm! I have checked the fuel filter and the guage for clogs. None found.
Is this vapor lock? Is my fuel pump bad? Just a bad pressure gauge? ?????????? help.
What could be wrong?
Also, I have a fuel pressure gauge (1 month old) right at the carb and when the motor is cold it's at 5-6 lbs. Once the engine gets hot, it drops to 0-1 lbs.....but here's the kicker...the car still runs fine with the lower fuel pressure reading. Even up to 4,500-5,000 rpm! I have checked the fuel filter and the guage for clogs. None found.
Is this vapor lock? Is my fuel pump bad? Just a bad pressure gauge? ?????????? help.