I am wondering the same thing....is it throwing codes? Oxy sensor still intack? black smoke out the exhaust(richness)?

Carbed - no check engine light. Oxygen sensor is new, doesn't seem to be black smoke out the exhaust. The thing runs like a top, just gets crap mileage.

There is an ECU of sorts, so I would wonder about a check engine light, but it's never come on, even when you start the car. Not to mention, there is no check connector where you could jumper it to pull codes.

My Truck: 1987 XtraCab DLX 22R 4WD 5 Speed Manual
"Speed has never killed anyone. Suddenly becoming stationary, that's what gets you." -Jeremy Clarkson