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    p0174 454 vortec

    I get nearly the same issue intermittently in my '99 7.4L. I've been shotgunning parts at it without much luck. I get P0171 (bank 1 lean) and occasionally P0174. I also get the same O2 code. My issue came up after installing new injectors. Mine runs fine most of the time and I drive it daily...
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    Heater issue?

    That valve applies vacuum to shutoff the flow to the heater core at the crossover valve, when you turn on max A/C. Unless max A/C is on, it should be fully open. the vacuum line should run to a solenoid on the firewall and then on to the intake. I don't think this is the issue. Make sure you...
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    Coolant leak, need help. 1998 GMC K1500 Suburban Vortec 5.7

    K05 is the RPO code for the factory block heater. My plug is zip tied to the heater return hose on the passenger side radiator.
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    Rebuilt 454 engine (slightly modified) Rebuilt tranny - stalls out in gear at idle - help...

    You are correct on the third picture being the correct PCV setup. The middle section is a pre-bent plastic tube so you'll need the hole setup (tube & valve). Just spitballing, but could this be a throttle position sensor issue?
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