Hello All,
I ran two cans of Diesel Purge on Thursday and my car still shakes (which is rather anoying and I can't imagine did form the factory) at idle. I don't like shaking at stop lights. The engine mounts are new as well as shocks. The mechanic told me I probably had an injector not fireing properly at idle and suggested putting diesel purge in the tank. I was convinced that would be a waste of money so I ran it directly through the engine undiluted. Sometimes it seems to shake less but usually it is the same. It runs around 750 RPMs at idle and once the engine is up to 1000 it is totally smooth almost like a gas engine car. Should I just up the idle speed to 1000 RPMs and if I should how do I do it? Or is there some other likely cause of this shake?

Tom - who after unplugging and replugging things in the engine bay has cruise control for the first time since he's owned his SD