I just need a quick answer as to what to try and fix my problem. I pulled this code from my '87 K5. No mods to engine just did a manual tranny swap and a 205 t-case. 24: Vehicle speed sensor (VSS) - open or short circuit problems or park/neutral switch circuit problem What could cause this problem? But this shouldnt cause the motor to miss and stumble right? I replaced the MAP, o2, plugs, wires, cap and rotor. It ran fine for a little while, like an hour but then it started running crappy again. So whats going on? I am prety sure a 24 couldnt cause this type of problem.