Idle Fluctuation

[Jake_16_1999]

I have tried searching for this but can't seem to find an answer. First off this is on my '97 Gst, off of a fresh rebuild, pretty much stock besides an intake, and some port work.

The problem is my idle will fluctuate ~300 rpm's, I have searched for a vacuum leak can't find one, tried adjusting the Biss screw, that only adjust where it is fluctuating. I also read the Vfaq's, and only became lost in what it could be. It seems like it could be something in the Throttle body? Does that sound right. I have read about the ISC motor and some other valves but I am not sure what to look for. Any help would be greatly appreciated.

Thanks in advance,

Jake

 

[Jake_16_1999]

Has anybody else had this problem? I could use the help as I am stumped.

Jake

 

[oldman]

1. Your profile says fuel pump, which one? If it's 255 make sure install afpr.

2. Get yourself a Haynes manual and follow the throttle body section, check the TPS, IPS ISC.

3. Perform a thorough boost leak test, fix any leak you find until you're able to mainten 20 psi. Pay more attention to all small vacuum hoses around the intake area.

Hope that helped.

 

[Jake_16_1999]

First thanks for the help. The pump is on my Talon, the problem is with my Eclipse. The TPS is new, so I am sue that isn't it, I guess I will have to check for more leaks.

Jake