69/302 idle problem

[Stingr69]

Old gas?  It does not last very long.

Easy thing to check - Pull gas cap off and see if the vented cap is working.  If you are getting a rush of air, the cap is malfunctioning.  Mine had the vent sticking bad and tank was caving in.  Cleaned my cap vent with spray Gumout and replaced the cap gasket and it works well now.

[ZLP955]

Worth checking fuel pressure too.

[KevinW]

Old gas?  It does not last very long.

Easy thing to check - Pull gas cap off and see if the vented cap is working.  If you are getting a rush of air, the cap is malfunctioning.  Mine had the vent sticking bad and tank was caving in.  Cleaned my cap vent with spray Gumout and replaced the cap gasket and it works well now.

Good Idea, but keep in mind the the vented cap is one way only, to allow air in to compensate for fuel being drawn out.  So if you get air rushing out, then that is ok.  The vented caps keep positive pressure in tank (keeps gas fumes from coming out).  But if the air rush is going INTO the tank, then the vent may not be working as Stingr69 says. 

[rszmjt]

First of all I would clean the idle air bleeds on top of the carb with some carb and valve cleaner, use the small plastic tube supplied with the carb & valve-cleaner and give each 1 a quick shot, then put a vacuum gauge on it to make sure the needle is very steady and not fluctuating or bouncing & then set the idle mixture screws with the gauge to obtain the highest idle vacuum .

Also 36 * total timing is not a lot of total timing in a 302, We regularly use 42-45 total with vac pull.
How much initial at idle does it have, and how much total mechanical timing in distributor? What pull & how much in pull? DZ302 seems to like at least 10-12 initial , but this depends on distributor mechanical advance. I’m sure Jerry gave you a sheet?

[motorman]

make sure the idle transfer slots are open about.020

[hornworks]

I once had a flakey condenser in the distributor do something like that. I Had a hard time finding it .