I just bought a turbo coupe for $300. It's a real hunk of crap. Outside of the body though, there are only some minor engine gremlins, one of which I'm narrowing down tonight. The engine has a hanging idle. After driving and warming up, the RPMs will hang up right around 2K, 2.5K, and 2.7K. Each time I drive the car, the RPMs seem to hang up just a little bit higher.
Now, I've already pulled the IAC and cleaned it. It did help to stabilize the car on start up and will hold an idle at any RPM strongly...eg, it doesn't seem like its pecking for an idle.
I've checked for a sticking throttle cable. With future diagnosis, this check will be rendered useless.
I've listened for vacuum leaks. Further diagnosis also declines this as being an issue.
After driving the car to the grocery store, the idle really wanted to hang up. I can deal with a 500 rpm hang over standard... that acceptable from a $300 car, but when I'm at a light pushing close to 3K...
So I opted to yank the TPS connection...stupid idea in most cases, but again, $300 car.
I drive it home and it runs GREAT! the Idle doesn't spike, the car runs smooth and everything minus the hicckup it has with quick pedal release...
So, if either found that the TPS is indefinately bad, or that by disconnecting it I've limp moded the computer and cloked my real issue.... what are your thoughts? TPS toasted?