Ok I will try to describe this as best as possible and include everything I have done to the car recently.
2001 Ford Focus SE DOHC Black top cover on engine. It has about 88K miles.
Symptoms: Car idles rough, battery light randomly goes on and off, lights dim on cluster randomly while driving at high RPMs, stalls when sitting still once warm/hot, AC will switch to blowing hot air.
Things I have checked or replaced:
New Battery less then 8 months old.
New Alternator 2nd one less then a year old
New belt tensioner
New IAC valve (triggered CEL most recently)
New PCV Valve and hose
New EGR Valve Pressure Sensor
New EGR Valve Vacuum Solenoid
Radiator levels are full, AC is charged, Battery levels while car is on stay at 12.8-13.8 depending on load and RPMs, Radiator fans kick on, no leaking of any fluids on driveway, the engine temp sensor in the hud does not go past half way. And there is no check engine light.
Any ideas guys? I am at the point of replacing random stuff, like the MAF, Cylinder Head Temp Sensor, O2 Sensors, etc.