Just replaced the intake gaskets to try and fix a warm/hot idle p0171 problem that otherwise matched all the cold idle problems.
Yes, that was it!
Also - no more weird pulsing sound. I figure one of them was leaking, causing that - and that seems to have been true. Tip when assembling - use high-tack gasket spray to hold them in place while you line up the manifold with the ports.
DIY: Rough idle in cold start/cold temps LGT 07-09
in Walkthroughs :: Basic Operation & Maintenance
Posted · Edited by hallkbrdz
Just replaced the intake gaskets to try and fix a warm/hot idle p0171 problem that otherwise matched all the cold idle problems.
Yes, that was it!
Also - no more weird pulsing sound. I figure one of them was leaking, causing that - and that seems to have been true. Tip when assembling - use high-tack gasket spray to hold them in place while you line up the manifold with the ports.
Bryan