Need Help

Well, Ignition and Fuel.
When something like this happens you need to go down the check list and insure each item is within the maintenance interval.
Its always a good idea to put a $7.00 can of Seafoam into the gas tank to assist in diagnosis.
Is your fuel filter fairly new?
Are your spark plugs under 25k miles?
Is you pcv valve in operation condition, and are you burning oil?
Whats the condition of the plug wires and ignition coil connections?
Check your vacuum lines and tubing for obvious cracks or leaks.
Go ahead and perform a Seafoam treatment in the upper intake too. Youtube has "how to" if you need it.