91 stealth base model wont start the check engine light only comes on once and a while in acc position - when it does come car starts right up. Sometimetimes flickers acc?

Here are some possible causes for your 1991 Stealth base model not starting and the check engine light only coming on intermittently in the ACC position:

- Faulty ignition switch or cylinder: The ignition switch or cylinder may not be making good contact, causing intermittent electrical connections.

- Faulty starter motor: The starter motor may be failing, causing it to not engage properly when you turn the key.

- Bad battery connection: Check the battery terminals and connections to ensure they are clean and tight. Loose or corroded connections can cause intermittent electrical issues.

- Faulty Engine Control Unit (ECU): The ECU is responsible for controlling the engine and its various components. A faulty ECU can cause intermittent engine starting issues.

- Bad or loose ground connection: Check the ground connections from the battery to the chassis and engine. Loose or corroded ground connections can cause electrical issues.

- Faulty wiring or electrical connections: Check the wiring harness and electrical connections for any damage, corrosion, or loose connections.

To properly diagnose the issue, it is recommended to have a qualified mechanic inspect the vehicle and perform necessary tests to determine the exact cause of the problem.