If it is fuel injected it would be a 22re engine. Your best bet with being a new owner is to buy a Haynes Manual for it (very inexpensive and a great way to learn about your new truck)) and look in the "Troubleshooting" section to start. Always check the most easy/cheap stuff first and work your way down the list as you check. Usually it's the "common sense" stuff that needs to be checked/addressed first(i.e. tune-up, vacume lines, fuel filter, etc.. These are great trucks, best of luck. Let us know what you find.