hello newbie to porsche

[adavis]

hi
i recently rescued a 68 porsche 912 from a guys front yard that had been sitting for about 8 years.
ive gone through everything
was running very well but today i seem to have a mis fire its a chug sound coming out of the exaust, and i isolated the cylinder by removing spark plugs one at a time. sound like an exaust valve.
i also tuned to weber idf carbs and the instruction said to close the air bypas valves while doing this, but it didnt say where to put them back.

ive been doing mgas for a while so i thought i would move up
thanks so much for your help in advance

[JayG]

Looks great for one you saved that had been sitting so long! Good luck.

[racerpaul]

Good Luck from a fellow newbie... converted from BritCars... couple of TR6s, TR250, assorted TR7s and MGB's

See my post...

912E Newbie! How am I doin?

[philip912]

The air bypass screws should be seated.

After you get the engine running decent at idle, using a syncronizer measure the downflow of air in each throat of the carburetors. If you cannot get the air flow equal in each throat by adjusting the mixture screws that is where the bypass screws come into play.
The bypass screw can be used to balance each throat to equal downflow. Once equalized, hold the screw in place and tighten the locknut. Much like adjusting a valve.

[J11]

Sounds like you may have a plugged idle jet...