we have an 01 gmc duramax lb-7 coming into our shop this week, its not our specialty so some advice would be apreciated! trucks got 60k on it, its had injectors replaced at 30k then 60k now closing in on 100k its acting up again, i suggested to run an overdose of howes meaner power cleaner and it helped alot but was short lived. The truck idles uneven, if hold at 1500 rpms for a bit and let to idle it stumbles around then levels out --not perfect but levels out. Seems the hotter engine the worse it is, ime assuming du to fuel being colder its more dence, In short is there a better way to adress this wrather than just r and r all 8 nozzles, is there a better nozzle out there?? You helps apreciated! Rich dighton ma. 1-508-669-5093 fax 1-508-669-6616. eamil a5cos@aol.com