I have a 2.3 in a Ranger 4x4
It runs rough and smokes gray pretty heavy;
then it will smooth out for a minute, the smoke will clear up and the vacuum gauge will read normal.
Then it goes back to running rough and smoking.
My check engine light doesn't work but when I pull the codes with an analog meter ( I let a buddy use my scanner, now he is nowhere to be found) the best I can tell all it's showing is EGR which is disconnected because I added a header.
Carbon fouled plugs
fuel in oil, a little over full line
good fpr on the rail
good fuel pressure
fuel pressure leaks to 0 in about 5 min (pretty sure its the pump I'll know in a day or two)
vacuum gauge flutters around 12-14
I swapped out the upper/lower intake, fuel rail, throttle body from an extra motor I have. Nothing changed
New fuel filter, plugs, wires, cap, o2 sensor
I'm really leaning towards timing but I'm not sure where to start diagnosing.
This truck is my toy/woods truck but I'm about to try and sell my house and it really doesn't add to the aesthetics of the place all tore down in my garage.