OBD code reads 67

[Bekah]

I have a 91 4.0, I had posted earlier about thinking it might need a fuel filter. I wound up changing the fuel filter and fuel pump relay (I had had problem with that relay before), and took it on a test run. Drove great for about 30 miles, then idling it started running really rough. Rpms were going up and down, the truck was shaking, the whole deal. My check engine light came on. I was able to limp it a little ways to a family members house. It was not feeling like it was getting any gas, but if I could get the rpms up pretty high it went fine. But as soon as I shifted it would bog out again. I just ran the code reader on it and it came up with code 67, which according to the book is the "neutral pressure switch circuit failure". But my first online search said that's for automatics and I drive a manual... also I feel like it might have something to do with a relay or fuse, since I've already had problems there. I'm just not sure where to go from here, and am looking for general advice

 

[franklin2]

Did you get code 67 during the key on engine running test? Or the key off engine off test? If it was the KOEO test, did you get the code 67 right away or later in the memory codes? Your manual transmission does have this neutral switch. It's hooked to pin 30 in the diagram below.

If the transmission was not in neutral when you ran the test, it will set this code also.