Hi having problems with our laguna previellge 2003 model recently had a major service, new spark plugs, timing belt, ac tensioner belt, steering rack ends as we just purchased this car with these problems we now are having trouble with chugging when driving and slow pick up until you get up to 80kms but this is not happening all the time it comes and goes but has a pattern of this when idling then at around 50kms then all the way up to 110kms as