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2002 Oldsmobile Bravada Questions

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Have a 2002 bravada Oldsmobile straight 6 why is engine light not coming on? Why is code reader showing nothing wrong. When brakes applied and vehicle in drive and you start to accelerate it has good power does not miss and has strong steady pulling power. If you quickly shove accelerator down to pass vehicle engine has extremely good power and not missing but driving on the highway and there is a slight hill and excelerator is maybe 1/4 way down and vehicle starts to lug or motor starts to come under slightest load and you have execelerated steady in the same position rpm might run 12-1500 motor has a vibration you can feel it on the steering wheel and through out the vehicle you can also tell the sound of motor is running tough while keeping the engine under a very slight load the vehicle sometimes starts hitching missing in and out feels like it is going to stop on highway. Then you accelerate quickly and then Vehicle seems to have good power and does not miss. When vehicle is runni
When the vehicle is running it idling erratically and engine is misfiring. also when the pressing on the gas pedal there's no acceleration
Replace key and tumbler on car ignition system try to start car starter turns over but will not start I think the anti-theft system needs to be relearn it is a passkey 2 system. It is currently at Tuolumne Street auto repair in Vallejo California he told me it was going to cost $500 up front is that accurate
What should we check
Then I pull over shut it off and start it up and take off then 5 "- 1 mile dose something
do trailblazer or Yukon parts also fit ?
I check fuses, replaced the blower motor resistor, front AC CONTROL MODULE, and Vent Mode Actuator. what else do you recommend
Friday car wouldn't start checked battery, changed starter still nothing exterior lights do come on
changed starter, checked the battery
THE SUSPENSION AIR BAGS DO NOT INFLATE AND THE COMPRESSOR DOES NOT TURN ON. WHERE IS THE SENSOR AND THE FUSE FOR THIS? THE VEHICLE IS ALMOST SITTING ON THE TIRES AND THE COMPRESSOR REPLACED 6 MOS AGO
Rear wiper doesn't work?
Both my interior and headlights flash while vehicle is setting still. what could be causing this?
after I stop at a light or put the truck in reverse or slow down bellow 30mph the truck will hesitate or cut off this happens every time I drive it we have already replaced the throttle body and the electronic cooling fan and spark plugs nothing has worked please help.
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