Electric choke question

the choke probably just needs to be adjusted, but it could be that the electric part of it has gone bad. try this, start the car cold and take the air cleaner off and watch the choke butterfly as the engine warms up, it should be fully open within a minute or so, if it doesn't open it is probabaly bad or the power wire has come off somewhere, use a test light or a voltmeter if you have one and make sure you're getting power to it, it should be getting a full 12 volts as well. if that checks out, then when the car is having problems, ope the hood and check it again to see if the choke is fully open or closed or if it is starting to open, if it starting to open you probabaly have a loose power or ground wire that is going "open" or losing connection at some point when you are driving. let us know what you find