Stalling stopping spitting and coughing...
 

Big problem all the way from Sweden..

Sometimes everything works sometimes stalling dies and are just a sick engine..

Idle driving reverse it does't matter it can occur whenever or not att all...

code P0771 what is that in this matter?

I chnged plugs and plugswiring to brand new OEM parts.

Checked for leaks

maybe the axhaust smells different smells a lot and it stinks like burned wax or something it'doesnt smell like it should anyway I'm born in a exhaustpipe so I know :D

it seems to run properly in lowgear position if I rev it to 3-4000.

Every turn I have to do is a gambling will it work today...but if going down always strats direct again and I at least humping and poffing my way home again...

No year model? No engine size? Help us help you. :)

Oops sorry 2002 3,3L V6

Thanks :-)

Start with the basics, remove the throttle body and the idle control valve on the throttle body, clean both really well with throttle body cleaner. Change the air filter.
You say the exhaust smells different - are you not burning coolant? Coolant will give the exhaust fumes a sweet smell.
Also double check the spark plug wires that they go to the correct spark plug, and are properly connected at both ends.

Clean everything like u said Etienne!
 

But it seems like something else..it's comes and it goes for example during feb-mars everything was fine..
And i fugure out that very careful ecodriving makes engine running longer without any problems but actic driving like kickdown and hihg revving makes it stalling spitting and coughing and sometimes dies but alwyas start again.
Troublecodes has been P0771 and last time a number saying problem with catalyst. (spelling)
And engine warning lamp can light and go off and go on again now its on and says catalyst maybe failing..

But its no problem with anything when u look or test it..???

Looking for edit function so i get mail when i get a tip ;-)