Vaccum leakages can cause high idling and misfirings and you should try to get this rectified first. Forget about what people telling what it could be and to check this and that. You need to follow proper procedures for diagnosing problems and not guessing on prossibilities. I only work on information you provide so if I get the wrong data, you are going to get the wrong answer.
Get a can of carb cleaner and after starting engine, spray a little the carb cleaner around suspected vacuum leakages and if the engine idling changes, that is the area you should be looking for leaks.
Do not over spray and concentrate on one small area at a time, with short spurts.
Injectors are at intake manifolds, attacheed to the fuel rails and not directly visible.
Wednesday, September 19th, 2012 AT 8:31 PM