340 Idle problems

Humor me and try something.

Disconnect and plug the vacumn advance line at the distributor after you have the car running. Adjust your idle down to around 1000rpm or less. Make sure it idles good. Now check your timing. Write that reading down. Now grab your light again and run the motor up to about 3500 rpm. Read the timing there. Write it down. Now set the timing at 3500rpm to about 32degrees. This is called total advance. Let it come back to an idle. See if you can drop the idle rpm even more. If you can great. Check timing at idle and write this down again. Take good notes.

You should also check how much vacumn you have at idle at the port you are attaching the vacumn advance line too. (Make sure you have attached it at the right spot!!)

Reconnect the vacumn advance line. Check your timing at idle again...write it down. (are we developing a pattern here??)

Test drive. Listen closely for pinging under load (ie..pulling a hill in second). If no pinging heard you can probably go up another degree or two on the total advance.

Take two of these and call me in the morning....... :thumrigh: