This would be easier if you lived near by lol. Well coils don't typically exhibit the symptoms your having but it's sometimes possibly for them to act in weird ways. When your driving and it acts up what happens if you give it more gas, does it clear up, get worse or stay the same. Though it's possible it could be your float, it could also be your fuel filter or rust in the tank. If you have duel tanks does it do it on both tanks?
I am digging up this old thread because I noticed something I hadn't before. My problem has mostly gone away, however when it gets cold I do notice something weird still happening. It usually is only when I start driving. After a while it clears up and drives normally, but it seems to sputter when I start to increase the throttle. If I barely touch the pedal and hold it there it almost stalls.
It took me a few tries to get it to stay running today because when I was pumping the pedal after it fired, the pumping only seemed to make it sputter more until it finally got past the sputter and into the higher rpms. It seems that the beginning of the pedal travel is what causes the problem, so slightly open throttle.
This definitely seems to be a carb issue so I might just replace the whole damn thing with an edelbrock and call it a day, but If its a simple fix I could save some money. I replaced the accelerator pump a while ago so It is possible it could be this again however it doesn't make sense that temperature of the engine would affect it or make it sputter when I slowly apply throttle. If it was the accelerator pump it would only sputter when I apply lots of throttle at once.
More likely it could be the float getting stuck. I took the airhorn off when I did the acc pump and couldve screwed something up when I put it back together (or it was already that way). If I am not mistaken metal expands when warm and contracts when cold, so it could be getting stuck while cold and breaking free as it warms up.
Any thoughts? I know this is an old thread, but for a while I thought the problem was gone until today.