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Originally Posted by hpbadger
I haven't clened the throttle body other than spraying the IAC hole with cleaner like crazy when I replaced it.
I replaced the TPS....the original was set to .34 but it was probably good. Checked for vaccum leaks and could not find any.
Got a QDM1 fault YES on the scanner. Noticed a hard to reach throttle cable stop but I don't want to mess with it.
Wierd thing is the speedometer is always reading 60mph to 220mph.
New TPS set to .54 did not fix the problem. I drove for 1 hr and idle suddenly came back to about 650 where it is supposed to be but I expect it to be high again when I start engine today. Real mystery. Hope I don't have to change the ecm.
hpb
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I have nearly the same problem as you and spent the my entire 3 day weekend working towards solving it, though I changed a ton of other things as well.
My problem is a faulty PCV valve connector tubing. The paired PCVs connect into a piece of rubber tubing about 10" long that runs along the rear of the block. You'll see if when you find the PCV valves.
After taking the tubing off, I could see that there are a number of very very small tears that are likely the source of my vacuum leak. A replacement house made from silicone is available from White Racing Products.
I also removed the plenum to check for vac leaks, removed the coil packs and starter to clean out the crap down in the valley, then cleaned everything well. In hind side, I'm glad I did all of this as there were clearly some mouse/rat droppings by the starter and my little friends had clearly been eating at insulation to the starter!
Replace the PCV valve hose and you'll be set. Watch out though. That little hose is over $150! I also rewelded the braces that connect to the aluminum tubing which connects to either end of this PCV tubing. One was snapped off and I didn't want to even think about how much it would cost to buy it new.