Some Issue For Power Loss

[uniteam]

Antecedent: http://www.gm-trucks.com/forums/index.php?showtopic=85679

 

When I bought this Nice Truck, I had the chance of buy a used set of tires and wheels... BFG Mud 37x12.50R17

 

The OEM 6.0L and the 4.10 gears was not enough to move those tires... I felt my truck very heavy, not strong , poor fuel economy and I never be able to spin the rear wheels... just the suffering of the engine....

 

Well, I decided to regear to 4.88 ... and when the mechanic installed them, I did some tests, and I fell more power and light truck.. and Now I can spin those big wheels anywhere very easy from STOP launch or burnout ... But some happen suddenly that my truck feels again without power, and the easy burnout goes far away...

 

I have the following DTC's

 

- B2752

- P0420

- P0430

- B0164

 

Before installed the 4.88's I was victim of CAT's Robbery ... I never replaced them ... I have just the muffler, but The absene of power was before on my truck even with cats ...

 

 

I changed (Spark plug wires, Plugs Bosh +4, Air filter, Fuel filter, fluids, cleaned TB and MAF) But stills without power.. and to complete my luck with the engine oil changes come the famous Piston Slap...

 

 

 

What could be ??? any thoughts ??

[svensk]

replace your oxygen sensors