87 wont shut off

Did a complete tune up it runs good but dosent want to shut down it Diesels a little, I set the timing and lowered the Idle speed but it still wants to diesel a little, the car has been sitting and we bought it for a project and I dont know if I may still have some bad gas in it or not, I ran it almost empty. Its a 87 Z 5.0 carb

thanks


Ira

Youre sure the firing order is correct and when you set the timing, you disconnected the advance wire?

Did a complete tune up it runs good but dosent want to shut down it Diesels a little, I set the timing and lowered the Idle speed but it still wants to diesel a little, the car has been sitting and we bought it for a project and I dont know if I may still have some bad gas in it or not, I ran it almost empty. Its a 87 Z 5.0 carb

thanks


Ira
I did remove the advance wire, but I havent checked the firing order yet, I just got the manual today so I know where to start, it dont miss or run bad it just wont shut down, I have heard that a gas cap could be bad, causing it when I do set the idle down it wont run, do you know anything about the gas cap, I cant remember if it has the vaccuum sound when I open it or not, I hear it can cause a gas lock..

thanks

Ira

usually two things are going to cause this, either a the timing is out of whack of b the carb is out of whack from my experience.

usually two things are going to cause this, either a the timing is out of whack of b the carb is out of whack from my experience.

How can I check the carb?

Preliminary point would be to check the idle speed and for any vacuum leaks.

But, let's back up a sec.

Did the problem exsist before you 'tuned' it up?

What did this "complete tune up" consist of?

I think retracing your steps will solve the problem if it didn't exsist beofre. The quadjet (e4mc) carb is not very tolerant to the inexperienced, no offense. Just stating, I don't think the carb is your problem at this point, I believe it's the ignition system..

Preliminary point would be to check the idle speed and for any vacuum leaks.

But, let's back up a sec.

Did the problem exsist before you 'tuned' it up?

What did this "complete tune up" consist of?

I think retracing your steps will solve the problem if it didn't exsist beofre. The quadjet (e4mc) carb is not very tolerant to the inexperienced, no offense. Just stating, I don't think the carb is your problem at this point, I believe it's the ignition system..

Well I have had ideling problems since day 1, I have replaced Cap,rotor,wires,coil,plugs, the car was in a barn and the lady died or something and her nephew tried to get it running, he had replaced fuel pump,starter,plugs,cap,rotor,O2sen, and a few other things, the engine sounds strong, it might lack a little power but It just wants to diesel now for a few then it shuts off, the carb may have been adjusted by the person before me, I dont see thata any holes have been drilled out to access the jets or adjustments thou.

The computer controlled carbs had/have a "fuel shut off switch" in/on them that is supposed to shut the fuel off when you turn the key off, to prevent running on.

The computer controlled carbs had/have a "fuel shut off switch" in/on them that is supposed to shut the fuel off when you turn the key off, to prevent running on.

But isnt that on the ones that have the fuel pump in the tank, mine is on the engine

But isnt that on the ones that have the fuel pump in the tank, mine is on the engine
Should be on all ccc engines.