Hesitation and Rough Idle

Hey guys sure you remember when I had the "stalls everytime I let of the gas", thread.
Well the cars up and running now with a TH350, on the column.
My symptons now are that it has a rough idle and if I dont baby the gas pedal upon take off it will try to stall on me.

NEW PARTS:
plugs
points and condesor(adjusted w/ dwell meter)
timing checked and set
vacumn lines(from trans to intake and pcv line also)
fuel filter
air filter

Once I am at cruising speed I dont notice anything but anytime I accelerate, you can hear and feel it missing and sputtering.
I am still not sure what the two screws on the front of the carb are and if they need adjusting so if someone and educate me on those that would be great.
Also my thought is to rebuild the carb and go from there.
What are your thoughts
Thanks in advance
Bernie

 

Don't know what carb and engine you have but it sounds like the accelerator pump is going out. It's usually a rubber valve that wears or tears.
Time for a carb rebuild. A two-barrel should be pretty easy.

 

Andy's on the right track.

The two screws on that old Rochester 2 BBL are the air/fuel mixture screws. Should be screwed in (not torqued, just snug) and screwed back out about 1-1/4 to 1/-1/2 turns to start. Then smoothed after the right idle speed is set, by tweaking each one about a quarter turn in or out.

I would have said the floats aren't responding. They're probably brass, but I think Andy's right. A rebuild makes sense.

If those screws have wear-rings from over-tightening, you should get new ones, or at least cleaner ones.

 

I got the rebuild kit this morning but after seeing the instructions I am going to ask a good friend of mine to do it while I watch and ask questions.
The exploded view of the carb scared me off.
It will prob be done on Monday or so I will report back after its done to let you know if thats the problem
Thanks
Bernie

 

Yep. Wise to know the right people sometimes, especially in fuel systems.

 

Ok I replaced the plug wires today and still no change.
i havent rebuilt the carb yet still waiting on that

I started getting white smoke out the tailpipes today. It only last until I get out of first gear, once Im rollin along I dont see it anymore, not sure if its because Im moving or it goes away
What could that be?
Thanks
Bernie

 

White smoke is vapor. Lot's of droplets out of the pipe?

 

Sounds like you still have a vacuum leak somewhere. Start the engine and remove the air cleaner. Take a cloth shop rag and cup it lightly over the air horn, "choking" the engine. If it smooths out, it is starving for fuel and probably there is a vac leak. Be sure to check the PCV and make sure it is not stuck open. I had a Dodge Dart one time that about ran me nuts trying to find a leak. It was the plastic valve in the brake booster that had cracked and was sucking air.

 

I went back out today and used some carb cleaner and sprayed the middle gasket area on the carb and it bog down just a little. That means there a vacum leak right there correct?

Still havent rebuilt it yet and I drove it on Sat and Sun and it drove decent(i adjusted the idle up some) Didnt stall but still cant stand on it on take off.

Also found out today that I am getting a 1990 350 block to freshen up and my buddy has some heads for it and really all I need to get is the intake and carb. Its a 4bolt main out of a truck. I am going to disassemble it prob Wednesday this week to make sure its good to use. Friend of mine called in a payback favor to another guy so I think I am getting it for $50.
Well see I will check back in sometime after Wed with pics and what not.
Thanks for the help
Bernie

 

Sounds like it's suckin' air in 4/4 time, but you ain't gettin' music at the wheels. If the carb is sucking in air between the bowl and the air horn, why not put a bead of permatex gasket sealant around the area and try it again, after it dries?

 

I've had problems with the screws that hold the carb body halves together coming loose.
Maybe just a loose screw or two.
It's easy to overtighten and strip the threads in the body, be careful.

 

Good idea, im all over that
Thanks
Bernie

 

I checked them also once I saw it was leaking, thier tight.
Thanks
Bernie

 

At least it might help until you get it rebuilt. Or another 100,000 feet.

 

So you saying the gasket stuff on the outside to plug a leak wont work?
Just wondering havent done it yet, really just want to get it rebuilt but my schedule sucks and trying to get with the guy thats going to help me with it is hard
Thanks
Bernie