Nelson Tune.... Round2

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Originally Posted by GenIII_4Ever

Well had a chance to check my fuel pressure at the rail. Idle it sits around 58-60psi when im driving around its 60-63psi. So im stumped besides the O2 sensors I have no clue lol.

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again what is the exact problem?.. what are the mods to the truck??.. Your throwing drivers side o2 sensor codes?...

Uhh...of course it's not the tune. You said in the other thread it sounded like something rattling around in the engine. It sounds like you have a hole in one of your pistons or a valve bouncing around in there.

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Originally Posted by GMCtrk

Uhh...of course it's not the tune. You said in the other thread it sounded like something rattling around in the engine. It sounds like you have a hole in one of your pistons or a valve bouncing around in there.

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Truck runs better now swaped out the burnt plugs. And took it on a 450mile round trip last week. Ran pretty good but still is a little weaker than normal on the low end.

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Originally Posted by GenIII_4Ever

...but still is a little weaker than normal on the low end.

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Probably because your truck doesn't have the supercharger on there anymore.