Originally Posted by partymn
I have the same floating idel problem pre mod. I am sure that its caused by gunk or the Throttle Possition Sensor, if the truck has one. I will post what I find tomorrow afternoone, post mod.
I had cleaned mine all out and made it pretty, but no joy.
Rechecked all the vacuum lines, WOW guess what I found...
Some jack a$$ packed a line full of activated carbon...
My guess is t get it to pass smog.
Cleaned all the crap out of the lines, but no joy.
So I installed a tach a few days ago and then turned down the base idle screw about a full turn until my idle sat at 650-700 ish (while the engine was warmed up). Now all is fine.