Only runs while the starter is engaged, but shuts off immediately after
My moms 91' Topaz fires up when you start it and sounds like it's going to run fine, but as soon as you release the ignition from the start position, it immediately shuts off as if the fuel cuts out. If you hold the ignition key in the start position, it continues to run and sounds fine. I thought the engine was just cold when it I moved it a couple weeks ago because it eventually stayed running after a few tries, but now it won't stay running no matter how many times you try.

