When its really hot outside say 90+ in the sun, my 3.0s idle sucks!!! It's kind of rough idling, and it will idle at say 800-900RPM with the a/c on, and around 500-700RPM with the A/C off. Once in a blue moon, when I kick my a/c on my idle actually goes down, thats happened twice now.

But the kicker is, when the sun goes down say 90 or less and no blistering sun out, it runs pretty decent still lightly rough, but the idle is normal at 800 RPM, and the A/C High idle is 1100RPM both right on the money.

Any suggestions?

 

My truck seems to do the same thing - the idle is slightly reduced in hotter weather. The truck still starts in the morning and the gas pedal works so I ain't complaining.

 

I'm trying to find my missing gas mileage, and my code 25, 26

I've checked everything... I'm beginning to wonder if my TPS is going bad.