Cold running problem

1979 F100 Ranger 5.8M AT 2WD

Will not run cold. Starts no problem. Let it warm up and drives away. Probably 5 minutes. Don't wait? Immediately stalls when put in gear.

Any ideas?

New carburetor, choke fast idle properly set, timing on the money, stumped.

Suspected vacuum leak but still happens with all lines plugged. Vacuum gauge shows about 30.

Thanks!

Automatic Transmission? C6? Vacuum--- Investigate the C6 Vacuum Modulator and its Line. Regards Sam

R> 1979 F100 Ranger 5.8M AT 2WD

I've read over the troubleshooting tips on the modulator and none of the described conditions exist; shifts properly, no smoke, etc.

Thanks for the response.

rinaldi