Why when I start driving runs hard for 10 minutes and after 15 minutes runs go

Hello, there appears to be some kind of engine performance issue that will need to be discovered via troubleshooting. Testing must be performed to see what element of the following is weak or missing: 1) Fuel delivery 2) Ignition spark 3) Air coming into the intake -- either restricted or too much 4) Exhaust flow restricted 5) Emissions controls concerns 6) Engine timing, compression Is there a check engine warning light illuminated? If so, testing can start there to find out what trouble codes might be present, aiding with clues as to where to start looking for your problem. If not, each system I listed must be tested to see if it is working properly or if there are clues indicating degradation of performance. A well trained technician with a good diagnostic tool that has data monitoring capabilities and a shop manual to use for reference will be able to get to the bottom of your concern with little difficulty. www.repairpal.com/repair-shops Good luck!