hesistation from a rough idle

[rob101]

just a quick query, I have a rough idle, so rough it will shake the car, when it gets this bad it also seems to hesitate to rev from idle. but once it revs all is well, I assume this is the Oxygen sensor playing up and making it overly rich at idle, is it possible it could be an AFM problem. Apart from the rough idle when the car is warmed up, the car seems to rev etc. pretty well.

[t_marat]

I have the same issue. People were saying to check the vacum by spraying carb cleaner.

[dacoyote]

Way off the wall.. but quick to check....

Make sure you value cover gasket isn't leaking.....

the plugs will short out and make a miss... are you missing at high load... it can be hard to tell on the M50

[rob101]

i replaced the valve cover gasket only recently, hmmm vacuum leaks, son of a b#$%$. Just to clarify, i meant Rough idle even after the engine has warmed up, and usually worse the warmer the engine is. which is why i suspect oxygen sensor. but apart from idling the engine runs fine it makes a bit of rattle etc. above 3k rpm but i think it is fuel injectors (sounds like e46 m3 apparently).