I need help! slant starts but wont run

It's not the ballast resistor. If it were, the car wouldn't stay running for any seconds after the key is released. Sounds like a faulty carburetor and/or choke. The choke must close completely before a cold-engine start, no matter what the ambient temperature might be, or the engine will either not start or not remain running. Tune-up parts and technique suggestions in this thread. Carburetor operation and repair manuals and links to training movies and carb repair/modification threads are posted here for free download.