Please help fellow stanger.

[FST-HUH]

OK I have 97 GT and car is ideling really fu**d up. Gas is getting stuck non stop. For example if I drive in 3rd and my rpm's are 3K I can let off the gas and RPM's will still be the same and won't drop down at all until I brake. Then when I stop at the red light rpm's are still high for about 15 sec before they start to come down. CEL came on and code was #1506.

I've already changed IAC valve and adjusted TPS. But it is really messin up.

what to do next??? Car was tuned 3 months ago. But the problems started couple weeks ago. Thanks in advance.

 

[Mike97gt]

that code is for iac overspeed. did have this exact problem before the new iac?

If you want me or others on here to help we need the exact symptoms before and after each repair attempt you made.

 

[FST-HUH]

yes the car threw the 1506 code before I changed IAC valve. So I thought it was IAC that's when I changed it and nothing. So I checked all hoses nothing I also went to the dealer they never heard of 1506 code "but the guy said it's IAC" Like I said when I drive car acts like it's in a cruse control mode RPMS are stuck always at same and never come down. Than when I stop at the red light they are stuck at 2K rpms for about 15 secs than they go down to 700 and sometimes even bogs down and dies. WTF

 

[stng]

Never rule out the possibility that you bought a defective IAC, I am not saying that is the problem and it probably isnt but its possible...

 

[FST-HUH]

I doubt it but has anyone ever heard of code P1506 Idle Air Control Over Speed Error. When I told dealer guy even he said oh man that's the first one.