andelamiles

So i have a 1991 300TE 4MATIC that takes a few tries to start up. It cranks every time and after five or six tries with new fuel and some starting fluid it starts up. It dies sometimes after it turns over but after a few times of the same process it will run. It doesnt run rough, it revs smoothly, and warms up properly. I would like to try to solve the issue so it turns over everytime. Ive also replaced the fuel filter, given it a fresh oil change, and changed the air filter. Can anyone help?