Join Date: Jun 2015
Location: Dalgety Bay, Fife
Car: Mini Cooper, MG TF, MG Midget
When I got my 135 a few years ago , when he seller brought it round it was running a bit lumpily which I mentioned to him but I got the usual "its always been like that, and they all do it" reply.
I wasn't really happy with it although otherwise the engine was fine and as I got the car to fiddle with rather than use as a comuter vehicle , I did fiddle.
I tried to clean the IAC valve but wasn't convinced I had been very thorough so I bought a new OE one, not a pattern part, fitted it, did a reset and the idle has been fine since.
Since then I have changed the coil packs and plugs just so I know it has been done and can't do any harm, and the idle when warm is still stable.
As said, it can't do any harm to change these things and may well solve your problem with the idle...unless the fuel smell is indicative of some other less apparent fault which is causing the bad idle.
Good luck with it!