Missing at Idle.

Hello everybody,
Just bought a "92" Escort G.T. With 125,000 miles. Has the 1.8 liter D.O.H.C. 5 speed. It runs pretty good. Has very high rpm's for a while then drops down and runs a little rough at Idle.It's a weird question , but It sure seems that the engine missing more at Idle when I flip on the headlights ? Anybody run across this ? For the most part I can live with it, just was wondering what was causing this ? The car has been tuned up and new wires and rotor. Thanks. Walt.

well i just got a 89 escort that haddent been running for 4 months an i have the same problem u might want to ajust the idle screw not toooo much tho have someone in the car and some one turning the screw when its running

try the inlet manifold gasket for leaks.