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Re: P0101, P0128, P0300,P0420 SES Light, power loss
101 - Check MAF electrical connector and hire harness.
128 - Check CTS resistance and wire harness. 5 VDC reference signal is common with the MAF, so it makes a little sense. This can also set if a thermostat with the wrong rating is installed. Use a 195°F only.
300 - Is the cap a genuine Delco? Almost all aftermarket caps fail within 5-15K miles due to poor insulation. Is distributor worn? Was the CKP/CMP timing checked?
420 - Likely a weak rear oxygen sensor, but measure signal to verify.
My guess is that most of your operational issues are related to the 300, and something in the distributor itself.
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