Carb crisis?

[carguy300]

So this just started about a month ago on my 68 300. It has always run real good since I got it running last year. New carb, edlebrock, all new ignition and charging. All stock. It starts up but acts like maybe running out of gas for a second and picks back up. It has gotten worse, doesnt stall but acts like it wants to. New tank and filter. Its starts good, good throttle response, does seem alittle rich. I put some berrymans in the tank yesterday and ran it about 20 mins, cold start it got bad but then cleared up. I will try it after work and see how it does. Does this sound fuel related or spark? It does not pop or back fire and on the road it runs like a scalded dog. I am stumped.

 

[413]

Do you have pertronix ignition?

How old is the fuel?

 

[carguy300]

Do you have pertronix ignition?

How old is the fuel?

Fuel is fresh, 90 oct. standard point condenser ign. All new, from Halifax.

 

[Fury1969WI]

this is an at idle situation that started with the cold weather and getting worse with ever colder conditions, that about right?

I'd make sure the choke and fast idle cam is working properly. You say it seems "a little rich." If you tuned it otherwise then it could be the choke is not fully opening when it should. Edelbrock has all their tuning info on their website.

Otherwise, and this is just kind of off the top of my head from 800 miles away, consider if you have;

- correct fuel pressure
- correct float set
- a fuel pump pushrod that's within spec.

 

[carguy300]

I have the choke wide open, Texas don’t really need it, it’s not a daily driver. Fuel pump and rod both new. I probably have less than 50 miles since I got it running. It is a brand new carb also. Been doing fine until just recently and has gotten a little worse each time. In the 70’s now, I’ll see if berrymans in over night made a difference. It’s just strange because it does run so good.

 

[carguy300]

After sitting with berrymans overnight, I fired it up, still acting a fool a couple times and cleared up. Retweaked the carb a little, let it run till cold light went off. Went on a 10 mile round trip to churches chicken and back. Wide open throttle a few times through shift points and she is back to normal, maybe even a little better! What a relief!, now back to working on back windows, waiting on headlight motor to get sent back. Thanks y’all for input as always.