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Originally Posted by Midlife ZL1
Little update, car has been back in my possession for a little while now. After it was all buttoned up and put on the dyno it only put down 765 horsepower, no where near the 889 that Lingenfelter had on their dyno sheet. So a little disappointed in that result but still more power then I have ever had.
It's been running rough at idle, bouncing under a 1000 rpms making me keep my attention on the brake pedal at stop lights. I go back to the shop tomorrow to show the tuner myself. Had P0174 a couple times. Today I found a hose that might be causing that, not sure? I'm bringing that up to him over messenger and in person tomorrow.
Car also stutters or gets choppy under full throttle, I don't really know how to explain it. It's a sound from the exhaust and I can fell it too. Here is the video of what I found with the hose today. What's everyone's thoughts on that? Cant a vacuum leak be the culprit of P0174 and the rough idle problem?
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Sounds like something's up with the fuel pressure. Log it with HP tuners and check the rail pressure amongst other things. Hopefully the smart guys will chime in. My guess is fueling. I do know for a fact that when you change pumps you need to adjust the flow rates in the tune.