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

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?

by in Chicago, IL on November 23, 2010
2 answers 2 comments
ANSWER by on November 23, 2010
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.
COMMENT by on November 24, 2010
THANKS DAVE. I HOPE IT'S NOT A TUNE UP. THAT DISTRIBUTOR IS IN A TERRIBLE SPOT.
ANSWER by on November 24, 2010
go to autozone get ck code for free it brobley carbon in egr valve autozone makes a gasket with a screen in it so it wont get carbon syuck in valve
COMMENT by on November 24, 2010
HEY DELANE, THANKS. I'LL CHECK THIS AS WELL.