Having problems with your 2004 Chevrolet TrailBlazer ?
The engine ramps up and down both at idle and when driving. I actually lose power and it almost feels like it is running on 3 cylinders, step on gas and it revs up but takes a few seconds to actually respond, you can actually feel when it "kicks in". Engine will stall at coast or at light when stopped and foot on brake, often even in neutral. Service engine light came on and i have codes 0134, 1133,0172, 0171. help?
Sounds like you have a couple of problems. I would start with checking all your vaccum lines with a fine tooth comb. I'd also replace your upstream 02 sensor (the one in the engine compartment, just below the windshield wiper fluid reservoir) sensor and clean your throttle body.
Repair Help & Product Troubleshooting for 2004 Chevrolet TrailBlazer
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