Question about 1999 Mazda B-Series

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99 b-4000. cel lean. o2/mass ok? miss fires driving or idel. cold before warming runs rough/stall/tries to stall. no vacuum leaks.with compressor running heat/ cold would here high pitch/ reving sound. like choke is working. thanks don

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If you can find the PCV valve and it's associated plumbing, I promise that you'll find one of the rubber elbows that connects it to the intake manifold has rotted out and is leaking vacuum. This is a very common problem.

Posted on Mar 14, 2011

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02 f150 5.4 runs ruff after it warms up


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Think I'll "shoot from the hip" on this one.
Just for the fun of it, check the pcv valve and the related vacuum lines.
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