- Jul 24, 2017
- Thunderbird Year
I bought 1966 thunderbird 390 engine which starts rough and after a few minutes it warms up it is still rough but not as bad. It drives well for a couple of miles then when I come to a stop it feel like it want to choke out, but it seem to be fine I step on the gas. I’ve replaced the carburetor with an Edelbrock 1406, PerTronix 2 and a Pertronix coil. Any suggestion on what might be the cause for the rough start and idle.