i have a 98 durango with a 318 it has a miss only when warm runs fine when cold. no code. just replaced cap, rotor, plugs. any other ideas.

 

Do you have a timing light and maybe a vacume gauge? If so you might be able to find this miss is limited to one cylinder. How did the spark plugs look.
You may have a bad temp sens telling the computer to run very rich. Or maybe if the miss is on one cyl. a bad injector.

 

Maybe one of your plug wires or boots is allowing an arc? I had this problem with my '98. The easiest way to check it is to open the hood at night and disconnect the underhood light. Look for any indication of arcing (spark) along the wires and near the plugs.

 

I would replace the plug wires and the coil. The windings in the coil could open when hot.
Also James idea is a good place to start.

 

i put new plug wires and plugs in it still doing itmy buddy said that it could be be one of the injectors