Why does my engine run rough at idle?
Why does my engine run rough at idle? This can also have a result on the muffler system again vastly restricting the exit performance of exhaust gases (engine). Excess carbon build up can cause the EGR valve to stick open allowing intake pressures to drop and the engine to stall at idle and run rough. Why is the EGR valve at idle not working? This could be caused by one of two possibilities... either the EGR solenoid is defective or the vacuum hose is attached to the wrong port on the EGR solenoid. Resolving this ‘continuous vacuum to the EGR...