Rough Idle Due to Intake Manifold Vacuum Leak on Mazda 626

The intake manifold gasket can fail causing vacuum a leak and/or a rough idle condition. Replacement of the leaking gasket will be necessary to correct this concern.

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Average mileage: 137,000 (99,000–175,000)
Engine affected: 2.0L 4 Cylinder
2 model years affected: 1998, 2002
3 people reported this problem
2 people shared problem details
2002 Mazda 626- 2.0L 4 Cylinder99,000
Idles low in drive shuts off
1998 Mazda 626- 2.0L 4 Cylinder175,000
Surged to the point of stalling. I ended up spraying carb cleaner at the point where the intake met up to the head and found when spraying the carb lceaner at the no 1 cylinder, the engine speed noticibaly changed. The Intake gasket was replaced and the issue was resolved.
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