If the car sat for that many years, one possibility is that your carb is varnished up. When gas sits in the carb it turns to gummy varnish, and plugs up jets, etc.

I work at a Marina, and 1/2 of our business comes from people who let their boat sit for a while, and when they go to use it, the boat will usually idle fine, but when you try to give it some gas, it bogs, spits, etc. This can even happen in a several month layup.

If you rule out everything else, have the carb soaked and rebuilt. Spray carb cleaners don't even touch the varnish I am describing, you have to soak it overnight, or use an ultrasonic cleaner.