holley 4150 tuning
 

all right guys here is the deal. been tinkering with my carb for a few weeks now and got all my driveability issues fixed but one. anytime I drive around town and light throttle it starts to get really hesitant off idle. it will miss a couple times and then usually wake up and take off. now its not the accelerator pump spent plenty of time tuning that. works fine just sitting there playing with the throttle in the garage or flat footing it from a stop after being out on the road. just not sure whats goin on. haven't tried and afr or pyrometer yet.

any thoughts would be much appreciated.

Re: holley 4150 tuning
 

Try a higher # power valve.

Re: holley 4150 tuning
 

talking about up front? ive got a plug in the secondaries.

Re: holley 4150 tuning
 

Yup, in the front; unless of course you're on the secondaries at the time the symptom is occurring.

The accelerator pump is nothing but a crutch to cover up otherwise poorly calibrated main & idle circuits. Once you get the carb working right, you'll find you can almost disconnect it and run without it, and not know the difference. In 99% of all cases, and closer to 99.999% of all street motors, being able to make ANY appreciable improvement in how the car runs by dinking with the accel pump, is a DEAD GIVEAWAY for the carb not being tuned right.

Start with the main jets. Follow the "Holley Tuning" sticky at the top of this forum, IN ORDER, step by step, starting at the beginning, not "oh I like this part I'll just jump into the middle right here", not skipping the parts you don't feel like doing (do em anyway), not "oh this is hard I'll just do this thing here that looks eeeeezy", IN ORDER as given in the procedure. You'll AMAZE yourself.