Help diagnose 1999 Suburban
#1
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I have a 1999 Suburban 5.7 L V8 which has been very reliable. It has been running for a while with a soft check engine code P0430. I have changed the oxygen sensors and nothing has changed. Lately it has developed a violent miss/backfire only after warming up and being driven a distance. Battery, alternator, thermostat, distributor cap and crank position sensor have been replaced. What is the next step to figuring this out? Thanks.
#2
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Could be the fuel pressure regulator going bad. It is located under the upper intake attached to the spider fuel housing where the plug attaches. If you have a scope camera use that to look to the back of the intake signs of leaking.
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