Originally Posted by jchargu3
My 88 s10 does this but only on a cold start.....
Does it get better if you get the RPMS past 3000 then let it go back to idle??
How are you reading TPS voltage and so on? Multimeter or ALDL?
Idle is best when cold, but that may be because it is trying to idle higher to warm up. It is by no means good. Reading voltage with a multimeter
Originally Posted by jchargu3
If you don't have it already you may want to invest in an OBD1 aldl cable to connect to your laptop/computer to see what the ECM is doing....
A lot of times the problem can be pinpointed just seeing the data that the ECM is putting out..
Do they have a good one for the speed density cars? I've seen them for MAF but they always seem to say that they don't work on MAP cars. Please point me in the right direction for an ALDL cable/program for MAP cars (or even a diagram to build the cable) if I am wrong here because I would love to do this.
Originally Posted by jchargu3
I know you said you did propane, but take brake parts cleaner or starting fluid, squirt it along all vacuum lines and listen for a rise in the engine, propane doesn't always do it in my experiences.
I did carb cleaner too, no change. I think if there is a leak it may be in the lifter valley.
Originally Posted by jchargu3
You may also have something simple like a bad distributer cap/rotor/module, or a loose wire somewhere.
Also check the MAP sensor, my truck runs like ASS with it unplugged, or faulty....
I doubt its just a loose wire. I have tested every sensor several times along with unplugging and plugging in all wires to them. I may have a sligtly bad distributor, but even with the EST unplugged and the timing stable at 8* BTDC the idle is still crap. I don't see how a distributor could affect the engine in any way besides the timing. Also, I tested the MAP by checking the change in output voltage vs change in vacuum. The base reading was in the normal range and it changed steadily when I changed the vacuum.
Originally Posted by jchargu3
But the ALDL stuff with winaldl would probably be a quick/easy way for you to determine it for this time, and future times you may have issues.,
Show me where and I'll do it.