Hi, all. I have a following problem which all local mechanics cannot diagnose and fix properly.

My car engine turns off when braking (means not idle-ing properly ) or when plugging into rear drive etc.

Works fine on cold start and after 30 min of driving or when engine gets warm the problem starting again.

So i have to shift to N when coming to stop and plug back to D when going :-) otherwise engine will turn off. Also few days ago engine started to have some knock's inside it. Replaced spark lugs oil etc. Mechanic's told me that mechanism which is connected to air filter is clean and clear. Sorry forgot what was the name. One told me that transmission box have some electirc pump or somthing is gone.
Does anyone had similar sit and solved? please help me.

If this is really gdi problem the new GDI unit gonna cost me 900$.

HEEELPPPP.

Also its possible to use octan booster or ankind of engine cleaners on GDI engine?. Rumor going that it will kill GDI.??

First of all I think your problem is electrical. It would eliminate some possibilities if you did change out your fuel filter and ran some injector cleaner through but if it was the problem you would see the symptoms when you were under load such as climbing a hill, etc. I wouldn't use the octane booster but ensure you are running premium fuel 95+ octane. GDI's are high compression engines and require high octane fuel.

OK, electrical fault. Most likely you have an intermittant connection going to or from the ECU. There are known problems with this and they can cause all sorts of unknown headaches. Dissconnect each connector in the engine bay and clean with a bit of emery cloth and spray out with electrical contact spray. Plug back in a couple of times and if you have any doubt if the pins are making contact bend them up a tad before re-connecting. Do all of this with the battery disconnected which will also re-boot your ECU on power up again. Make sure you do all leads to each sensor including tranny.

Hope that this fixes your gremlin as it has for others (inc myself). Don't expect many mechanics to know much about GDI engines. They can be a pain if something is not right but generally the repair is permamant

Jim