So I went to the parts store the other day and left the truck running with the AC on. When I got back in it and put it in gear it died. It cranked right back up and I was on my way. I went to another parts store and same thing. It happened all around town as I went to four or five different places. It was over 100 degrees that day and the needle kept going up around 225. It has never done that before. I'm doing a radiator flush this morning. Any ideas?

 

mine did the same thing once. i think i just changed the fuel filter. you may have to tweak w the idling??

 

Yep, that's usually just an idle speed adjustment. Over the years, the idle screw wears a bit where the linkage rides on it, and the speed gets a bit lower.

The spec is 800 RPM in gear, with the a/c on, and a warm engine. 850-900 in park is usually right in the ballpark.

 

Ok guys thanks for the help. I'll give it a go and report back.

 

That was def the problem. Thanks for the help!!!

 

Glad we could help. It's nice when it's something minor.