1996 K1500 Interior light / Tune up problems

[wixi]

My interior light will come on and stay on when it gets under 40 degress out- What can I do to stop this?

\Also I just gave my truck a tune up the service engine light came on and there is now a spark nock. I had it diod and they shut the light off but when I stepped into it the light came back and so did the spark nock. I changed the plugs, wires, distrubter, cap, rotor button and O2 senser. Anyone have any ideas?

Tim

[Cam7]

What was the code from the service engine light?

[Pamsdad]

Wixi

Check you door jam switches.

I had same problem when it got cold.