Best person to get involved her is CalMetal....the IDF's are a little different than the IDA's that I have.
It would help to know what type of engine and then what size main, idles, e-tubes, idle holders, chokes, and air correctors you have on the carbs....
Where did you get your car back from? Did you just put the carbs on and have they been tuned? Have you check the sync on the carbs and are they all the same (the IDF's should have an adjustment screw that will allow you to get the barrels exactly the same on the sync).
All of these we will need to know then we can figure things out.....
Ohh have you pulled the plugs to make sure they aren't fouled? Let me tell you mine have been a trial and error bigtime to get them close to right and I have probably $1000 in jets and crap.
Matt - I am slowly learning alot about these things...helps when you take them apart 20 times....
