Having problems with your 2002 Chevrolet TrailBlazer ?
Opel astra 1600 16v jerks at low revs when car is hot/warm, fuel filter new air filter new, replaced fuel pressure reg, new plugs, still the same, 3 bar feul rail.
Sounds like the iac might be giving problems, check ur idle air control valve on the side of you throttle body if its working right, replace if not.
Repair Help & Product Troubleshooting for 2002 Chevrolet TrailBlazer
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