Hi guys. I am still fighting this problem. Here are the items that I checked/tried. I adjusted the choke and made sure that the butterfly closes properly. It didn't really help. I tried different adjustments just to see what the differences are but it didn't help. I checked to make sure that the accel. pump squirts gas into the carb. Every time I pulled the throttle is squirted a small stream of fuel. I also started the car and watched the choke butterfly to make sure it stayed closed after the engine started. It did and then after a few minutes gradually started to open. Then I tapped the gas and it came off of high idle and the choke opened completely. (same rod as my fast idle cam) Just for background this is an aftermarket electric choke with the sensor that bolts to the valve cover. I didn't install it. It came with the car. Please let me know if I did something wrong.

Now here are a few more things I noticed. The engine's coolant temp was around 170F and I let the car run/idle for about 8-10 minutes before driving. I drove down the road. The throttle was fairly smooth until one point and then it felt like the carb was trying to make a transition but it was having trouble. The car almost had a large bog at this certain point. It didn't want to take more gas unless I pushed it down quite a bit more. More than I would during normal driving. I drove around for a few minutes and I noticed it also when I started to go up a hill. Everything was smooth then I started climbing the hill and then about halfway up with no adding much more throttle it started to bog then I gave it more gas and it was fine and went right up the hill.

Now after it warms up everything is as smooth as one could hope for. There is no hesistation or bog. Also, if I just let it idle and warm up sitting in the driveway without driving it, it will run great too. However, the coolant temp seems to like to get up to 185-190 before that bog/hesitation goes away. I am not sure what is going on. It has the same problem in reverse as well going out of my driveway. I will give it gas and hold the throttle fairly still. Once I get to a certain point on the driveway it will start to slow down and want to stall. If I give it just a little more gas it will stall but if I give it 1/4 more throttle it shoots me right out of the driveway with no problem. Also if the car is warm it can crawl right out of the driveway without hesitation.

I talked to Joe at CarbUSA and he was kind enough to spend sometime discussing this with me. He thought it sounded like a choke issue as well. I did everything he asked me too and I tested everything he asked me too and I still can't find the problem.
Could the problem be in a transition circuit in the carb? Guys I would appreciate any info on this. I am very pleased with the way my car runs except for this problem. For many of us car guys that is very rare. Normally, you have a to do list or things you want to do to get your car just the way you like it. I just have to figure out what is causing this. Please let me know any ideas you guys may have. I will be glad to try them. I thought I might be down a cylinder or ?. I checked for spark on all cylinders. I removed one plug wire at a time to make sure the rpms dropped equally. I have all new plugs, and wires. Checked the idle speed and timing. Like I said I couldn't ask for the car to run better when warm. I drove over 40 miles the past couple of days up hills and around without any problems except when it is warming up or not up to 185F. Thanks.