Question about 1999 Chevrolet Express

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Po135 hallo i have problem whit the chevy 1500 express from 1997 5,7 lt when the car is cold and start than the first mijl bump our stotters he when the car is warm than have no problems thesucatwelli car have a new oxygen sensor

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You may want to check for condensation build up on the spark plugs, spark plug high tension wire, ignition coil and crank shaft sensor. Normally on parts that are wearing out, moisture that occurs overnight or during cold weather may get in the electrical components such as sensors and conductors preventing it to work properly. Other than that check, for vacuum leaks where moisture may come in or leaks in the manifolds.

Posted on Aug 18, 2009

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