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Q: WHY DOES MY 1998 OLDS BRAVADA HAVE A REALLY ROUGH IDLE AT START UP ? on 1998 Oldsmobile Bravada

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THIS PROBLEM HAS JUST STARTED IN THE LAST WEEK.RUNNING VERY ROUGH AT START UP BUT ONCE IT WARMS UP IT RUNS FINE.THE LAST TIME IT CAUSED MY CHECK ENGINE LIGHT TO COME ON.I DO NOT HAVE ACCESS TO THE CODES.WHAT COULD BE CAUSING THIS?
(2) Answers
(2) Comments
There are many possibilities, but if I had to guess, I would suspect you have a vacuum leak causing lean fuel trim codes...bascially the engine takes in too much air compared to the fuel it is supplying. Can cause rough running. On the other hand, you could have a misfire from tune up related items. A good diagnosis is in order to give you direction. Good luck.