Engine Performance problem
1994 Honda Prelude 4 cyl Front Wheel Drive Automatic 24589 miles
When car gets to operating temp it starts to idle rough. Before it gets to operating temp it idles great, I can pull #1, 3 & 4 plug wire off and the engine changes but when I pull off #2 wire their is no change, the plug wire does have spark. As long as you keep the car at 2500 and above the car runs great ahd has good power. I have changes the dist rotor and cap, new plug wires and fuel filter. Any suggestions.