Here is what I have done since I purchased the truck. Tune up- changed the distributor, cap,rotor, spark plugs and wires Cleaned and put a kit in carburetor Changed water pump, radiator, thermostat,fuel filter, air filter and vacuum hoses. After all that is done it is hard to start and I have to put the heater on high to get it to idle when it is cold. Once it warms up you can turn the heater off and it will idle fine. After a while the idle gets sluggish and the truck wants to kill. Put the heater back on and it will idle up and run ok. Any advice will be helpful. I will try sea foam and run it a while to see what happens.
Sounds like vacuum,since you have gone through the carb. you might want to look at a couple of threads in this forum if you haven't already.One is titled" choke-idle is too high" and the other is" desperately need tuning help". Lots of good information in both these threads just do a search in this forum for them.
Jim, Thanks for the help. I read through the threads you recommended and figured out my problem. My mechanic had two vacuum lines crossed. One of them was the choke. Swapped them around and it is now starting and running great. I also ran sea foam through the fuel tank. Also figured out that my truck is a 1995 model. Thanks again!!
