[traindriver]

Gun Doc,

With your latest testing, here's what I surmise....the top end of the idle circuit is current running lean. This was likely being masked when you had the 70 idles jets in. Basically it was very rich at idle and off idle, at the top of the idle circuit, the large idle air jet (120) would lean out the mixture to something reasonable as the 70s were buriying the idle circuit in fuel. The remedy for this is to reduce the idle jet holder size. My engine is very similar to yours, I'm now running 50/80 on the idle circuit with nice results. Small idle jet holders are hard to find, the easiest thing to do is to solder the 120 hole closed and drill a new hole at .80mm. I can solder and drill the holders on my mill for you if you need help. A quick test you can do while driving is when the car is in the bad spot, does it get better if you let up on the throttle a bit or does it get better if you give it a bit more throttle? My guess is the former (less throttle). This would confirm a lean condition.

I was looking at your posts from last fall, are your air correctors (main circuit) still 120? If so, these need to be opened up to about 60 points over your mains. This is easily done on a lathe.

Chuck