Been having problems with my 93 again. Lets start with the basics, rebuilt super stock 3.0, regeared, auto tranny, 4" lift with 35's.

I've this issue for about 3 years, and now it's a common occurrence and is starting to become dangerous. The trucks idle is very low, on either hot or cold days. Never a problem on hot days, just shakes the truck a bit when stopped. On cold days, the truck will idle so low that eventually it stalls out. Sometimes at start up the idle is low (200-300 RPM) when its really cold, but for the most part it has problems after the engine has warmed up and has been driven around and then stopped at a stop light. The idle gets so low, that the lights dim, the truck shakes, and the brakes are stiff as a board. At this point if I come to quick stop the truck will stall out.

Here's part 2 to the story. When it is exceptionally cold, the truck has problems getting fuel to the cylinders, and basically the more i push on the accelerator the slower it goes. For instance, when going up a hill I will push on the gas to change gears for more power, and the car will decelerate and lose power. I used heat which seams to work fairly well, but today driving home from work it happened again to the point where i couldn't go faster then 30 MPH. If i pop it in neutral i can sometimes rev it up and get the engine to turn faster then 2-3k RPMS, but then soon after it goes right back into the normal power loss/ low idle.

Here's a list of mechanical parts replaced,
Engine 30k miles ago
Radiator 30k miles ago
Power Steering Pump 25k miles ago
EGR 20k miles ago
Fuel filter 20k miles ago
Brake Booster 10K miles ago

The same issue has happened for about 3 years, but only on cold days. Ideas, thoughts, suggestions? I love this truck but if it continues to drive this way I cant drive it anymore. Help save the yota

 

Do you still have a catalytic converter? Maybe replace the fuel filter again or at least check the sock on the pump itself.