Check to see if the wires correctly. If that is ok then check to see if there inside of the distributor cap is clean and free from debris... spark will take shortest path and fire at the debris instead of the next cylinder in firing order.
SOURCE: Mitsubishi 2.6 L engine only runs on 2 of 4 cylinders
check your valve lash and compression.You can get a cheap compression tester at auto zone.Any thing under 100 psi or a difference of over 30 psi between two cylinders suggests worn parts or improper valve lash.
SOURCE: 1996 Honda Accord Rough Idle Even After tune up
Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps
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