Why would a cold idle speed be 1500rpm when it's hot outside? on 2000 Toyota 4Runner

It's a 90 degrees out every day. The light came on and the code read- rich mixture problem. There isn't any gas smell from the air filter. I bought a new gas cap. May have to get new o2 sensors. The intake housing coupling (the accordion one)cracked and was repaired with black silicone.

by in Brunswick, GA on September 25, 2013
Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer 2 comments
ANSWER by , September 26, 2013
what are your eng codes?
COMMENT by , September 26, 2013
P0172 air/fuel mix system rich (bank 1) probable cause: 1.injector or fuel pressure regulator leakage 2.faulty MAF/VAF sensor 3.ECT faulty 4.Faulty H02S/AF sensor I just had valve cover gaskets and ignition coils installed. Thank You for your help.
COMMENT by , September 26, 2013
reurn and ask if they could have left something unplugged or connected wrong