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What can cause a rough idle on a 1999 Chevy suburban 5.7 litre?
Wiki User
∙ 12y ago
'Bring up the engine speed slowly and if the vibration increases slightly until it disapears altogether the two of the cylinders are not igniting and the ignition coil pack must be changed. If no vibration can be felt then it is more likely to be a small leak in one of the vacuum lines to solve this you must listen closely under the hood for a 'hissing sound' usually on or around the intake manifold but not limited to these locations .If a vacuum line leak is detected hold a thumb over the line end and listen for a change in engine note
'Bring up the engine speed slowly and if the vibration increases slightly until it disapears altogether the two of the cylinders are not igniting and the ignition coil pack must be changed. If no vibration can be felt then it is more likely to be a small leak in one of the vacuum lines to solve this you must listen closely under the hood for a 'hissing sound' usually on or around the intake manifold but not limited to these locations .If a vacuum line leak is detected hold a thumb over the line end and listen for a change in engine note
Wiki User
∙ 12y ago
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