I just bought my first 7 she is an 82 FB12A. The idle sounds a little rough, and the idle ranges from 500 rpm to 1100 rpm. Also when the motor is cold she likes to stall when I try to move from a stop, unless the choke is pulled out about half way till the motor warms up. I'm thinking it a carb or loose throttle issue.

 

well the first step is to go thru the tune up procedure. there is a page in the factory shop manual that just runs down the adjustments, manual is at Foxed.ca

so step one is to get it fully warmed up. step 2 is to locate the idle mixture screw, and adjust it until it runs the best (should be about 2.5 turns out +/-1 turn). if you need to smog the car, adjust it to where it runs the best and then go an 1/8th turn richer.

there is an idle speed screw, but you shouldn't have to touch it, ever.

step 3 is to check the timing.

if the car stumbles when the engine isn't warmed up, it may be normal, the choke stays on until a certain temp. however, the mixture screw effects the choke, so getting it right might help. another thing i would look at is the thermostat, you want the thing to warm up quickly

 

Thanks. when warming up how quick is quick?

 

Usually you'll go from dead cold to normal operating temp within 5 minutes or less. Depends a lot on outside temperature & how long since it was shut off.

When everything's in order, the choke will actually hold in the out or half-out position until the engine hits op temp, then let itself in.