Check the linkage,with car running push linkage, rev engine,if that works looka bottom,right side of throttle body there is a screw turn it to the right rpm's will incress idle.
SOURCE: 2003 chevy tahoe front rear end fluid
i think what you are talking about is the front differential. you will wanna put gear oil in it. the correct weight would be found in your manual.
SOURCE: Where is the oil sending unit located on a 2003 Chevy Tahoe 5.3 engine
its in the block behind intake manifold .
SOURCE: 2003 tahoe idles rough and stalls
might want to check your mast air flow sensor. if your check eng. light is on have the codes downloaded
SOURCE: airbag light stay on 2003 chevy tahoe
The air bag light will remain illuminated if a fault has been detected in the air bag system.
The onboard computer will need to be interfaced with diagnostic equipment to read the fault.
This is also the only way to reset the light.
Good luck, I hope this helped.
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