86 nissan pick up wont stay running

[Big Bee]

I have a 86 nissan 720 pick up, 2wd, 4cyl and when the engine heats up it stalls while driving. I have replaced the fuel filter, plugs wires dist. cap rotor button and its still the same any bright ideas anyone!! vacuum hoses, engine timing, carburetor, maybe ????????

[Rev_D21]

Does the truck run rich at all? Is the auto-choke working properly? What did the spark plugs look like when you pulled them?

[Big Bee]

the spark plugs looked "normal" but its does seem like its running rich

[Big Bee]

and lets me add it mainly does it when stopping or slowing down

[Rev_D21]

Auto or Manual?

[Big Bee]

auto

[Rev_D21]

Have you checked the choke to make sure it's opening when the engine gets warm?