Hello Everyone - I am new to the Tahoe Forum. I have a 2007 Tahoe LTZ. 90k miles. Check engine light is on and throwing codes P0121 and P0300. Changed the throttle body and the same problem is still there. Engine still shaking. RPM's get lower and lower as it sits in idle. Not sure if fuel pump or catalytic converter is bad. What should I do next?
I Need Tahoe Help!
- Thread starter Eddie_M
- Start date
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kntrydr
New Member
I know it sounds crazy but check the spark plug wires I had the same codes and it was a bad wire shorting out and for some reason it threw out the same codes hope this helps
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