Well, a four barrel carb uses two barrels most of the time. You have to really punch it for all four to kick in. So it's possible to run it in town without all getting gas. Having said that, it should be running better under normal conditions. Try letting it idle and try to see if there are any vacuum hoses off. Put your finger over any open ports and you may find your problem. You'll know immediately if it's a vacuum issue. That's where I typically have problems.