I posted this rough idling message a month ago and some gave me the input to help solve the idle problem and had to replace parts that were suggested by our friends like MikeH, HO, Dmitri and others who extends their expertise but to no avail did not remove the idle problem. So, I decided to let a mechanic with many years of experience and good reputation in solving other volvo car problems to look and see. The mechanic diagnose the car for a week and can't find the problem and suggested to replace parts that I've replace already...in other words, can't find the culprit.

I am still experiencing this rough idle for a month now and to give the description of the parts that had been replaced: (these parts were replace trying to solve the idle problem)

bosch ignition wires then back to volvo bougicord ignition wires
ngk pfr6 spark plugs
bosch distributor
bosch rotor
super coil upgrade
bosch fuel filter
bosch o2 sensors
maf sensor
air hose
k&n filter
change vacuum hoses/elbow
driving selector switch
idle motor
*car has no EGR

the mechanic suspects the fuel injectors because I mentioned that I replace
2 of these injectors a few months ago with the right part number and specs, thought of changing 5 of them to balance the fuel flow? would this cause the ROUGH IDLE if the 3 old injectors where not changed?

Why not bring it too dealer? I had a bad experience with them in the past where a work that I brought was not done but charge me the same, worst, they left my oil sensor open to found that I lost almost all of my oil the next day. Thought of bringing this car back to other dealer if still can't find the problem.

Again, I would appreciate any expertise you have out there. Thanks guys!

ChrisQ 97 855 T5 58K