Carburetor issues on 1981 Pontiac Trans Am 301ci.
Hello. I have an odd problem with a rebuilt carburetor I recently purchased. Here are the issues:
1) I cannot plug in one of the electrical plugs (top right, greenish color with three pins, on the original carb it was white) or the cars idle will fluctuate wildly. When I try to accelerate with it plugged in the car stalls almost to the point of dying out and sputters until getting to a fairly high speed.
2) With that disconnected, I can get the car to idle perfectly, and accelerate better. However it still does not accelerate correctly. If I accelerate slowly it makes a bit of noise and has very little power. And if I try to accelerate quickly, not only does it not have power, but it makes a loud popping noise and misses. The only thing I can figure is I am getting too much air and not enough gas.
3) When the engine is cold, it has a lot of trouble starting, it runs absolutely terribly, it stalls, shakes, misses, and makes the loud popping noise even under light acceleration until the engine warms up a bit.
The car is a 1981 Firebird Trans Am, 301ci 4.9L non turbo California model. Everything is stock. I have rechecked the timing, done a full tune up, checked for vacuum leaks, and a few other things. None of those are a problem. So in your opinion, why would the electronic connection cause this carb to act so erratically? And if I can get the carb to work correctly with that connection in, will it fix the other problems? I had none of these problems with my old carb, including the electronic plug. It worked just fine with my old carb. Could the air/fuel mixture need adjusting? Or possibly something else you can suggest? On a final note, the only thing different about this carburetor aside from the plug being green, is the base gasket it came with was open, and the old gasket was split three ways. I don't know that it is important, but I'm trying to give as much info as absolutely possible.
Thank you all in advance.