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I got a reduced power light and the car was driving slow. I cleaned the throttle body and put it back on. Now the power is back but it staggers at about 30 mph. I took it to the mechanic and got code p1516 and p1512. What do I do?

Was something else to be done after the cleaning. All we did was clean and set up back.

Vehicle: 2003, Saturn, Vue, 2.8

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Did you disconnect the battery after you cleaned it? this will reset the ecu which may help. 

if that does not fix the issue, I think the throttle body may be bad. carbon build up on the throttle body might burn the throttle position sensor.

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