So the other day I did a tune up on my 92 400e. I did caps rotors plugs and air filters. After I did the caps and rotors it ran fine then I did the plugs and air filters and started it again then after a few minutes it started to idle rough. It did not do this before the tune up??? Maybe the gap on the plugs, checked everything over, for vacuumed leaks, next I will pull all the plugs and check gaps. Anything else I might look for??