About 6 months ago my car's revs started playing up a bit. If I came to an abrupt stop or turned the air con off if it was on, the revs would drop to about 450rpm, then bounce back up to 1500rpm several times before idling normally.
Since the cold weather recently, it's started to happen everytime I stop and it is sometimes dropping lower than 450rpm and just dying on me. It's doing the exact same when say I coast during driving and I have to jump the clutch whilst it's moving to restart the car.
Also, i've noticed there's a lot of smoke coming out of the exhaust lately when the engine is cold. I did over-fill the oil as I wasn't concentrating but it's been fine and the smoke isn't blue... just a white colour.
Another thing is I can go out in the car and it'll be fine. It won't bounce the revs. Then I turn it off. If I need to use the car again though within a short space of time, the car won't start first time without me turning the key for a while and during driving the revs will start bouncing again.
This suggests to me it's an engine management problem?
I've heard of plenty of fixes for these symptoms and don't know which to try. When it comes to cars i'm hopeless so cleaning the throttle body is out of my league. I spoke to Vauxhall about the EGR valve and they hadn't heard of a recall on my car and I thought it might be that at one point?
Anybody any ideas?
Thanks for taking the time to read my essay by the way