My Monte has been stuttering at high RPMs and dying at lights at low RPMs. I got a trouble code saying bank 1 running lean. Any ideas where to start or what to fox/change? HELP PLEASE!!! I LOVE MY CAR AND AM SICK ABOUT THE WAY IT'S RUNNING...

 

It kinda sounds like the cat. Mine did about the same thing until I replaced the cat. Runs fantastic now.

 

Sounds like a big vacuum leak. What engine do you have and what year? Check all vacuum hoses.

 

Check fuel pressure & filter, air filter, spark plugs, wires, etc