First,
WELCOME TO THE BOARD!
Second, take a deep breath and relax.
Third, the Rodeo Sport comes with two engines. Is yours the 3.2V6 or the 2.6 4-Cyl.
Fourth - The CEL is a PITA, but, you have found this board and it is your new comfort zone.
See, don't you feel betta all ready :lol:
The CEL indicates something is wrong with the emissions control system. Typically, this is either the EGR (Exhaust Gas Recirculating) Valve or the O2 Sensor(s) located in the exhaust line near the catalytic converter. Your truck may have two, one in front of and one behind the converter. The converter is a muffler looking contraption further forward than the muffler itself.
You can have your CEL code checked for free at either AutoZone or Advance Auto. There may be others. Most shops charge about $60 to read the code(s).
Get the code(s) read, and post those codes back here and we can better explain what may be happening.
Topically, it sounds like your 02 sensor may have crapped out - which is typical with the mileage your reporting. They take a lot of abuse in the exhaust line. If this is the case, then your motor isn't possibly receiving the correct air/fuel mixture on startup if the computer thinks your motor is at operating temperature and its actually cold. - THIS IS ONLY SPECULATION - Get the codes read.
If you plan on having your chariot for a long time, consider getting the service manual here:
http://www.helminc.com - Spendy, but worth its weight in gold.
Also, get in the habit of checking the oil (if not already) - I always get paranoid about that when problems such as yours start cropping up.
Good Luck. Keep us posted.
Cheers,