Truck wants to stall when I rev in neutral

[newnavy101]

I have a 1985 2wd 5 22r carbed 5 speed pickup that has been acting up. I visited 2 local toyota dealerships and talked to the parts guys but they really dont know what is causing this. They told me to adjust the dash pot but since I do not have an automatic I do not have a dash pot, so that cannot be adjusted.

This is what happens. I have an external tach.
After the car is at normal operating temp and I am in neutral, I will rev the engine to 1500 rpms and the engine will drop down below 500 rpms and want to die for 3 seconds then will die or jump back to idle at 750rpms.. It depending how high above 1500 rpms I rev it depends if it will die completely of go back to idle at 750 rpms. I am at wits end with this and really dont know. I just changed my timing chain and thought that had something to do with it but it didn't. My timing is right on.

Someone must know what is wrong. HELP!

[rogerman]

maybe the carb is dirty? or gas related prob like its bottle necking idk much about carbs

[rogerman]

or the carb may need rebuild or replacement

[newnavy101]

I ran seafoam through it so that should have cleaned it out. The float is fine also. I am puzzled

[keegan _A_H]

just dont rev in neutral....

[newnavy101]

That was just an example. In real world driving when I come to a stoplight and have to put it in neutral or hold the clutch in my engine wants to die. It only happens when the rpms are dropping to neutral.

[chilli]

Is there an EGR valve on your engine?

If so, check the hoses, and the valve itself.