Misfires are more proably in the ingnition systems .....anything from a plug to a wire to a ingnition coil .......if its a 2.5 you could proably change the plugs and the goto he wires and after that it would be a ing coil ........if you can`t find whitch cylinder is misfiring .........if it has over 30,000 miles it needs it anyway so you aren`t throwing money out the window ...
After it get hot see if you can get it to skip by power braking it
Put in gear and slowly press gas pedal and while holding brake see if you can get it to skip .........
bg
December 2005