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  1. hey yall I have left my 4k machine in perfect running order back overseas, and come back to oz to land a new job in renovations so i quickly went out bought the cheapest van i could get that seems to run. I ended up getting a 1993 mitsubishi express also known as L300, which has a 4G63 2L SOHC carby for 1300 bucks. Got it and it was ok, but noticed black spark plugs on my first service, so had a good look at the carby and removed it n found the secondary throat diaphragm was stuff, so i got a new one for 90 bucks n stuck it back on and the power at high rpm was about 1.5 times better. Anyway, after doing that, which involved removing the carby, i now have this problem, where after the van has been runing for a while, like 5-10 minutes and the engine is hot, and i have been accelerating and driving normally, as son as i come to a stop the idle is surging between about 700 - 1200 at a guess (i have no tacho) in cylces of one second. i.e. in one second it has gone between 700 and 1200 rpm. If i shut the engine off and start er up again, it is immediately resolved, but after some more hard driving, it is back again so end up turning the engine of at the lights to reset the engine to a god 700 rpm idle. Its quite dangerous as it really affects engine braking. Some points and history.. I bought the van last weekend. It wasn't surging until i removed the carby and reinstalled it with new secondary diaphragm After i noticed this surging, I immediately assumed i had introduced a vacuum leak where the carby joins on to the manifold because the gasket was stuffed, so i made a new one, but the problem remains, i am adamant there is no vacuum leak there. In order to remove carby, i had to pull out of it, what i assume is the idle solenoid, has 2 wires coming out of it, and i don't think its functioning properly, i think its stuck open, as the damn thing diesels 90 percent of the time i try to turn it off, and i have to put it in gear and clutch out to stop the engine haha... (could be related to the issue perhaps?) When i had the carby out, i cleaned out the visible muck in the throat with supershit 2 dollar degreaser, and also sprayed a bit around the passages and idle circuit to give it a clean, I saw a good steady flow of liquid exiting the idle solenoid hole. How can turning the engine off stop this idle surging, i can't get my head around it. Also, why is there an O2 sensor in my carby engine, what does it control? is there some sort of fuel computer which is being fed by O2 sensor info, and is being reset every time i turn the engine off?? Confuzzeld and need assistance from u guys. CHeers
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