Tell you what... Im blown away by how much of a difference the venturi clean out made. The idles almost perfect! A few small hiccups but I think that that's just a idle mixture screws, but other than that its perfect! Thank you so much.
Now I still have a bit of a fluttering when I hold it at a higher rpm, could that be the mixture screws too? Anyway I think im going to tackle the vacuum hoses tomorrow and ill let you know if that has any effect.
I've run the Carter BBD on my 4.2l for 25 years. I actually have it running as smooth today as when I drove it off the dealer lot. Great advise on the idle tube fix (this can be done without removing the whole carb). In addition to the clogged idle tubes, other causes for your symptoms are with vacuum leaks. I use carb cleaner to identify leaks (some folks get nervous about fire, but I've used it for years-knock on wood-with nary a problem). Check for a leak at the EGR valve as well. This is a sneakly little spot for a leak that will leave you scratching your head.
As long as the throttle shaft isn't wallowed out, you CAN get the Carter idling well. And don't be afraid to yank that sucker off and rebuild it. They're not near as complex as you would think.
Hey pman, yes I'm really happy with my results after cleaning out the "idle tubes". I think I'm still going to post some pictures of my carb. maybe a video of its operation, just to confirm that everything looks like its working relatively like it should.
About the vacuum leaks, as iv said before I plan on replacing the lines. However what you said about the EGR valve caught my eye because iv noticed that mine has no line even running to it.
Anyway hopefully I manage to do a good job replacing the vacuum lines. When you check for leaks with carb. cleaner... are you spraying it on the lines and looking for bubbles? If so could you use soppy water, or would you be concerned with getting it in the carb. and thus into the engine?
No, Vacuum sucks so soapy bubbles won't work as well.
When you use sprays and such to check for leaks, you are looking for a change in RPM or smoothness in the idle. Any change will indicate an area were there is a leak.
I just switched from a YF to a BBD and I'm happy so far.
Yes, you can see them get sucked in.
You will also hear the rpms change for a bit because of the sealing action of the soapy water. The rpms can go up or down depending on how much got sucked inside.
I mix it just thick enought to be able to spray it.
John-Would really like to see that vid
TO the OP-Take some carb cleaner and flush out the stepper motor area where you see the pins. A small piece of crud can jam them just like the v'cluster. ALSO, made sure the ele. plug on the stepper motor is clean with good contacts to the harness.