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1998 GMC Sierra - P0430
I keep gettinga P0430 code on my 1998 GMC Sierra. It suggests a large vacuum leak, a running condition, or poor catalyst function. I switched the secondary O2 sensors side-to-side, and the same code came back on about 150 miles later, so the problem is not a bad O2 sensor.
Prior to the code first coming on, I changed the intake manifold gasket. I dont' think we missed anything (except for a fuel line that is seeping; we are going to tighten that down tonight). Is anyone aware of anything that can be causing this code? Should I just replace the catalytic converter?
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