oaklander

My 1988 2wd 2bbl carb Toyota Truck has problems when it first starts up.
First off it has black stuff come out everytime if it has been sitting for more than 8 hours. The black stuff looks like soot and sprays the ground for about 5 seconds. Then it has rough idle like it loops and sometimes wants to stall but never does. I cleaned the choke area and that helped the early morning idle.

The truck runs great after it has been running later in the day with a normal idle with no looping but the startup issues after 8 hours of sitting seem to be related to a choke problem? Also my temp gauge in my Truck doesnt seem to be working but I do have heat in the truck whenever I use my heater.

Please advise how I can check and fix this problem?