Originally Posted by Gen1dak
If your model truck has a trailer towing package, it has a transmission temperature sensor. Since you probably do not have that package, you could be getting a low voltage signal since there's no sensor. The MIL light doesn't always illuminate when dealing with the code 37....go figure. The sputtering sounds like you have a failing intake plenum gasket.
I could of sworn I covered the trans temp sensor, which they didn't have on the 1995 model year anyways. It wasn't until 1996 did they begin to put the sensor in.
But anyways the sputtering sounds more like a fuel problem than intake, I think we should recommend he connect a fuel pressure gauge and vacuum gauge this ways we can rule out both.