is it fuel injectors

These types of problems require a proper diagnosis. It sounds like your guessing and replacing parts in the hope that you'll get lucky, expensive approach I imagine. I would check * fuel pressure and volume from the pump * ignition system is functioning properly * Fuel injection system is operating normally * fuel mixture settings

Livde with this problem for 1 year before I found out it was the incorrect type of spark plugs that were replaced during a tune up. They are of a special type and this is a fairing common issue at the dealership with backyard mechanics. If this has been done around the time you,ve seen this problem replace them with dealer supplied ones. B2600i.