TBI....really bad idle

[texassquarebodies]

Bought an 1987 burb the other day. 350tbi. It idles like it has a huge cam in it. Drives good down the road. Anyone have ideas where I might start looking for the problem?

[Jonboy]

I would start with the CTS. If you have a scan tool, you can look at the sensor readings to give you a little bit of an idea what it might be. A bad CTS will act like a stuck choke and make th evehicle run rich.

[70inline6]

I agree with Johnboy, but you can also do a quick check to see if you have any burned wires (O2 sensor, temp sensors) and for split/loose vacuum lines. The computer won't know what to do if there are massive leaks or grounds where there shouldn't be.

[texassquarebodies]

Jonboy....whats a CTS?? I probably call it something else.

[Jonboy]

CTS is the coolant temp sensor. It should be located on the front half of the intake, and have 2 wires.

[texassquarebodies]

I know exactly where that is. You can't be using all those fancy words with me. I will probably just switch it out with a good one I have.