Thanks for all the good suggestions.I ran a diesel purge-no change,cracked the injectors and they all seem to react the same way -making the engine start to sputter.Checked all my fuel lines and tightened clamps,adjusted idle,changed fuel filters and finally had a compression test done which came out fine,no change in the rough idle and stalling under 1500 rpms.Car is undriveable at this point....I noticed some leakage at the seat of the injector lines where the splined bolt meets the IP pump,could this be an indication of bad pressure valve seals? thanks!