Question about 1997 Pontiac Bonneville
I would recheck the vacuum. also if your brakes are harder to stop, you could a hole in the booster diaphram. if all that checks out then I would be looking at the exhaust before the sensor, and at the intake manifold for leaks. best way to check the manifold is to use WD 40, just spray it around where a suspected leak might be. If the engine smoothes out or runs a little higher that is where the leak is. Also you could have a bad sensor.
Posted on Nov 09, 2010
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Posted on Jan 02, 2017
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