This is probably a leaking pcv hose put your hand behind the intake manifold while the car is running and you should be able to feel it sucking in. The elbow on the intake manifold will **** in and rip. This is not an easy hose to replace.
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Check for a vacuum leak under the hood. Most heater and a/c systems rely on vacuum pressure to open and close doors and direct hot and cold air. The vehicle stalling could also be that vacuum leak.
Look for a small diameter hard plastic hose. They always seem to dry rot, if it's bad it will fall apart when you move it. Best way to find a leak is to use a 2'-3' piece of water hose. Put one end against your ear to listen for vacuum leaks while the engine is running.
Hi, Most Ford products have vacuum actuated control valves in the heating and a/c system. Ford designed a fail safe system into their cars and trucks that if all vacuum is lost that the system would default to defrost so at least your windsheild would stay clear. Typically there is a canister under the hood mounted to the fender well that looks like a metal tomato juice container from the 60's. That cannister is the vacuum reservoir that is supposed to hold the vacuum under high load (heavy acceleration) conditions. If that "tomato juice can" is either disconnected or if the check valve in the vacuum line is bad, then whether you are heating or running the a/c, under hard acceleration air will come out of the defroster vent. Check all your vacuum lines running from the intake manifold to that canister and back to your heater and a/c system for cracks or leaks, Also check that the check valves in the vacuum lines are in place the right way (they should only flow one way- toward the engine.) Listen under the hood when the engine is running for the hiss of a vacuum leak. Fix any leaks that you find. I hope that starts you off in the right direction.
I would look at the fuel level in the carb and make sure it is at the correct level. This is set by adjusting the float tab in the carb fuel bowl. I would also look at the accelerator pump and make sure the membranes don't have a hole in it or spring in backwards, or is leaking. It sounds like too much fuel is being squirted into the carb with the slightest movement of the accelerator. My Truck was a 1987 California emission vehicle. (Way too complicated carburetor vacuum controlled mixture emission system) I found when ever I did a "carburetor kit", every so many years, it would work great. Since you did a rebuild, and had everything apart, I would just make sure all the vacuum lines and one way valves are correct per the diagram under the hood. There are also some lines that are run through temp sensors on the engine so when it warms up, the vacuum is cut off. My trunk had a "cold engine pump". The vacuum control was shut off when the engine was warm. It would squirt extra gas into the carb to keep the engine from stalling when cold. If the engine is hot, it was too much fuel. With the engine running and hot, set the parking brake and run the engine to 2500 or 3000 RPM with the air cleaner lid off. Move the throttle back and forth and see if you can see fuel being squirted in or not. Please be careful and wear eye protection just in case of flame back. I think doing a careful carb kit and cleaning, plus verifying your vacuum line connections will take care of this problem. What ever you do, don
Sounds like a vacuum leak in the motor. Backfiring may be its own problem altogether. Backfiring only occurs when cold air is being introduced into a hot exhaust stream or when the timing is off. Check for vacuum leaks under the hood and leaks in your exhaust. If you have a leak in your exhaust it could be interfearing with your emission sensors and giving your motor false information.
check everything you can under the hood your air intake system all of it especially make sure all clamps are tight .. and make sure all vacuum hoses are good and not cracking or broken or just loose . you might run a little fuel cleaner through a tank of gas too cleaning the engine fuel system up some. just a few ideas.. Jerry
First Replace your Gas Cap. It has a Leak around the Cap causing the Erratic Idle. Next- Go to Wal Mart and Purchase 2 Cans of B12 Chemtool in the Automotive Section. Run 1 Can at a Time through a Full tank of gas. This will help Tremendously!
check for a vacuum leak,you could possibly hear a whistle under the hood,or you can spray starter fluid near the intake manifold where the suspect leak could be and if the engine accelerates it has an vacuum leak,try the simple things first,can also be a clogged PCV valve,it is in the valve cover somewhere and it will have a rather large rubber hose going to the intake manifold