I have a 91 b2600i with 113000 miles. Just had heads worked on b/c of oil problem. Now that that's finished, I realized I also have a rich fuel mixture problem.
what are the possible culprits? I know of the engine coolant sensor, fuel pressure regulator, o2 sensors.
anything else? I'm not getting a check engine light, but my plugs are fouled big time. Black smoke and difficulty cranking it.
can the MAF cause a rich fuel mixture?
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