Hyundai Repair: Rough idle, mass air flow sensor, throttle position sensor

Question
Thanks for the reply, in regards to the Throttle Possition Sensor could it be possible that it needs a clean? and is it a case of simply taking it off and squirting some injector cleaner or wd40 in it to clean it out? only trawling through different forums on the internet i've read that this has solved some peoples rough idle and i wondered if it could be done with my lantra.
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Followup To

Question -
I,ve got a 1999 1.6 gsi Hyundai lantra manual transmission, and it's got an intermittent rough idle when stationary (at lights)etc.. it can be felt throught the steering wheel and the rev counter flutters very slightly when the idle does, the power seems there, starts fine , it's just so annoying, i've done a compression test and all the compresions were 13 bar except cylinder 3 which was 13.5 bar and got there a little quicker, it's had new plugs & air filter, i've cleaned the plate in the throttle housing(didn't take it off though, just cleaned around the plate with injecter and carb cleaner), another thing i noticed today was if the electric windows are fully closed and i try to close them further the idle drops slightly when i press the button, and if i turn the steering right round the idle drops slightly, so could it be electricly orrientated?

Answer -
The procedure with the window and p/s cause the idle to drop because they put significant additional load on the engine.  

Your compression sounds good, so I doubt you've got an internal engine issue.

I'd supsect the plug wires, throttle position sensor, or the idle actuator itself.  Perhaps even the mass air flow sensor.  But that's still a lot of possibilities.  If you're able to check all that stuff, have at it.  If not, and the problem happens often enough for a shop to replicate, it may be better for you to take it to a good driveability shop to have it diagnosed.  At this point, I think we're looking at a lot of expensive parts and a lot of guessing without a conclusive diagnosis.

Answer
If you were to try cleaning it, I'd recommend contact cleaner.  But you'll have difficulty getting the solvent inside the sensor, and your results will probably be poor at best (if the throttle position sensor is part of the problem).  If you determine the problem is with the TPS, I wholeheartedly recommend replacing it.