Toyota Repair: Engine dying, intake manifold gasket, 22r engine

Question
I have a 1990 Toyota pickup with a 22R engine and a mechanical fuel pump.On idle the engine lasts about 10 seconds before dying,if I push down on the accelerator it keeps going,until I ease of back to idle then she dies,any assistance would be greatly appreciated.
                                       Scotty

Answer
There is a possible air leak at either the intake manifold gasket or the base of the carburetor, the most common is a leak near the EGR valve on the manifold, get some carb cleaner in a spray can and spray it on the manifold gasket  and see if there is a change in the rpm, if the gasket is leaking the engine should race to a high rpm without touching the gas pedal. If that's not the problem let me know.