Question about 2004 Chevrolet TrailBlazer

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My TB is stalling while driving...had ****** rebuilt and while driving I have to put it on neutral then drive or it will lose power...mech could not diagnose prob says it needs new computer?? Can the computer be repaired or does it have to be replaced and how much does it cost.

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Probably needs the idle relearned. which is done with a scan tool

Posted on Nov 28, 2011

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Posted on Jan 02, 2017

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Loses power while in 'drive'


all gears ok but drive, full power from engine to tires, 1,2,R
right? but not drive. drives acts as Neutral or weak.
did you do the stall test , in drive.
1000 rpm weak, engine
2000 rpm good
over that much is tranny slip.
tranny issues.
read the fsm. then the on car service, section

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Go out in AM, car is cold, starts and runs fine. Drive short distance, stop and restart, runs fine, idles fine. Drive about 8 miles at 50-55 mph, pull up at a red light, when speed gets down to ~25-30...


The EGR valve is unserviceable which causes a bad or insufficient fuel control for em-missions......Hope this helps you out........EGR valves are not very expensive.

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Car stalls when put in 'drive'


Check your air horn (big rubber boot) to the throttle body. It may have a crack on the underside and when you put it in drive and the engine torques to that side the crack opens and causes it to die.

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To what degree do you lose power and in what way? Do you loose over-drive or does it loose power and speed (on the streets, highway, or at any speed). From your discription it does sound like either a fuel flow/pressure issue or a clogged cat.

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