I've got a 1995 3.4L v6 5 speed, and I started having an issue where it runs fine when I start it cold, has no problems, but once it reaches around ~165F it starts idling very poorly and erratically, and if I try to add throttle it stalls out immediately. It's not showing any service lights and I'm still waiting on my OBD1 reader so I can't see if it's spitting any codes quite yet. If anyone has any ideas or knows anything that could point me in the right direction as to what's failing I would appreciate it greatly. Thanks!

 

There are a lot of things that can cause this. Dirty or Lazy IAC, EGR valve Sticking, Just about any Vacuum leak that is just feeding a couple cylinders and even Bad O2 sensors. The list is so long because wires build resistance as they get hot. So it could be plug, wires coils or just about anything electrical.

 

I appreciate it Gorn, thanks