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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.The first thing you need to do is to install a fuel pressure gauge and monito the fuel pressure while the problem is occurring. Normal fuel pressure should be right at 28 to 55 PSI. Anything less then 28 would indicate a failing fuel pump. Check this for me and post back with the results and we can work from there.
Have you scanned the computer to see if there are any fault codes setting?