I just changed the plugs to TR6's gapped @.35 as recomended by my tunner. Now my service engine light is on. My car is running good but I wonder what what I did wrong. Any help would be great.
Recheck all your work.
A guess would be a line, hose or wire left unconnected especially on the passenger side.
If you can't find anything, see if you can get the code pulled and we can go from there.