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2003 Sierra 5.3 Random Misfire and O2 sensor codes
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Question
absinthminded
So, I have an 03 Sierra 1500 with the 5.3L 212,xxx miles. Saturday I noticed a coolant leak. I did some digging and found that my water pump (or gaskets) had failed and dumped coolant all over my driveway. I swapped in a new water pump (napa lifetime warranty) and took it for a shake down drive. Its running really rough. Check engine light is blinking and the engine is missing. I changed out plugs and wires today and there was no change. They were old and I figured they were due.
I ordered a new coil pack. Just waiting for it to come in.
I ordered 4 Denso O2 sensors (they might be original)
I have yet to test the fuel pressure.
Injectors might be dirty?
Fuel filter was changed 2/3 years ago.
Fuel pump is original.
My wife needs to drive it to Chicago this weekend. Where should I start?
Thanks for your help.
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