multiple checkengine codes- help!

[poppyseed55]

1998 camry v6 -
code P0171 - I have cleaned the MAF sensor and it did not work. I am noticing hesitation between acceleration and deceleration. While accelerating or decelerating it disappears. Maintaining speed is a problem.
I also have codes P0125, P1133, P1153 and P0420. I was hoping to tackle the acceleration/deceleration issues first. anything ideas are much appreciated.

[hill8570]

Those codes pretty much imply you've got an air leak downstream of your MAF sensor. Could be in the main hose between the MAF and the throttle, or could be a disconnected, holed, cracked, or loose vacuum hose. Check your main air instead hose connection and hose between the MAF and the throttle. Check your vacuum hoses against the diagram on the underneath of your hood. If you see anything that might be a vacuum leak, give it a squirt of something fuel-like (I usually use throttle body cleaner, since I've usually got a can around). If the engine stumbles when you squirt the suspected leak, you've got confirmation.

[poppyseed55]

Thanks for the info. We sprayed all of the intake and vacuum lines with starter fluid and there was no excitement to the motor. RPM's remained the same. Next steps?

[dc_98_cam]

The scan codes that you have seem to indicate something wrong with the oxygen sensors, or possibly the catalytic converter.

What scan tool are you using? Does your scan tool allow you to check anything having to do with the oxygen sensors?

Check the operation of the PCV valve ... top of valve cover probably.