Hesitation during acceleration on 1970 Dodge A-100... please help?

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snakehairover9thousand!

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I just got a 1970 Dodge A-100 Van and it's having a little problem taking off. It hesitates as I accelerate. It has a brand new rebuild engine and transmission with only 200 miles on it. It has a new carburetor with less than 50 miles on it. And the radiator has just been fixed.
It kinda jerks back slightly, not with much force, then sounds like it might give out, like not enough gas is getting to it or something, then takes off fine. This happens when I come to a stop light or when i stop the car. When it's in idle it sounds fine, even when it drives it sounds perfect, just hesitates a little. Anyone know what this problem might be?
thanks Paula.
the gas is really old. like 6-7 months its been sitting there. i dont know much about cars, im learning. what exactly are "floats"?
the fuel filter is still good, and my father in law just redid the timing on it, so it should be fine, ill ask him to check it again though. im not sure about the fuel pump, i havent check it but its about 10 years old or so. i was thinking about buying a new one anyways.
does this clarify more to you what it might be? im really interested in getting this car fixed.
also meant to add this in the last part.
we put a "fuel injection/carburetor" cleaner in it today and it helped a lot. but it still doing it a little bit, and it doesnt happen every single time i come to a stop at a light or something, just every once in awhile, but it does it more than it doesn't.
thanks DodgeMan
i will recheck timing tomorrow. lets say this doesn't work, where should i go from there? i wish i knew more about cars so i can just do it, but it sucks i dont. i will replace the fuel filter just to make sure also. and i put some new gas in it today, but its probably mixed around with the old stuff, so ill wait till its completely used up and put good quality gas it in.
after i read about the catalytic converter, i was going to have it taken in tomorrow also if there is room for me to have them clean it or w/e they do.
so, what should i check after timing if this issue continues? in the future, no matter what i was going to replace the fuel pumps and pretty much everything i can, but i wanna get it working perfectly, then add all the newer parts once it works.
thanks guys/girls for all the info and help.
 
the distributor on these old trucks use mechanical points, have the point gap checked and replace the points if the gap is too big, have the distributor timed. if this is the problem,consider getting an aftermarket electrical distributor so you wont have to deal with it again.
 
are your floats adjusted properly? Is your fuel pump working and is the fuel filter changed? Do a total tune up. And check the timing. Is your cat old and worn? The catalytic converter may be clogged. Could also be bad fuel you may have bought from somewhere you do not normally get it from too. Actually scratch that last part, it may be bad gas from sitting. Buy some fuel rejuevenator (yeah I'm tired my spelling is bad lol) that will refresh the fuel still in it's system.
 
once you make sure all the tune up things are correct then the pump squirter needs to be enlarged.Usually they are around .025 and make it .035 and hesitation should be gone.Be sure the fuel level is set correctly first
 
if its a rebuilt carburetor you don't need to mess with the floats on it it should be under warranty,try adjusting the timing on it that will cause it to hesitate like that some,when an engine is new it has to go through a break in period and sometimes they will have a small amount if hesitation in them at first ,id check the timing and make sure its where it should be at and go from there with it,and get that old gas out of it,that will make it do that ,gas only last for about 3 months in a tank if not treated with some kind of a good gas treatment,good luck
 
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