Ok, dammit. I have fixed all vacuum leaks (had to weld up the intake plenum), adjusted the ECU to factory setting, adjusted the valves, timed it, tweaked the air bleed, and the damn thing still idles inconsistent as hell. (2.0 Djet)
I have removed the decel valve, AAR valve and the cold start valve. Pertronix ignitor, timed to 27 degrees BTDC.
At start up, it purrs nicely after about 30 seconds at 1000 rpm.
After driving, any one of 3 things will happen, with no consistency:
1- idle will return to 1000 fine, or
2- idle will return to 1000, then steadily slow and will die if I don't stab the gas, or
3- idle will race up to about 1700 and will not come back down
What the hell is going on? The only thing I can even remotely think of is a worn throttle shaft that may allow some air in when it is in a certain position. But that would seem to me to be maybe a little more consistent?
The throttle body could totally be sticking. You damn near described it too a tee. This is pretty easy to check. You can normally see one set "line" of junk that the plate stops on. See if you can see yet another line above or below the first one you see. I have 2-3 customer cars doing this right now. They live with it because it is nowhere near as bad as you have described.
B
Brad- When I had the TB off, I did notice some build up of black residue under below where the plate would be at closed throttle position. I sprayed it with some carb clean, some came off, but more stayed.....hmm, I'll pull it back off and clean it up good and see if that helps.....
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