Hey guys i have a 2007 Silverado 2500HD Classic 6.0 liter and i got a issue at wot! when i hammer the truck it goes thru 1st gear no problem and shifts to second. Once in second gear it climbs to 4k and then the rpm stops and hesitates there for a second or two then climbs again and the truck really feels to pull again. Then once in third it flat lines again at 4k and actually dropped 300 rpm on me while still at full throttle a couple of times. I have removed torque management but it did this before hand. No problems with starting, idle or cruising just at wot. i have cleaned the throttle body, cleaned the mass air flow sensor, clean air filter. kinda puzzled would appreciate input. Fuel problem, sensor gone bad, ????

 

Fuel filter?

 

I thought that at first but found out the fuel filters are in the gas tank on this year truck

 

I thought that was only on the new body styles. Classic body styles should still have external fuel filter.

 

I believe in 2005 or 2006 they went to this set up, had a 06 half ton that was the same way

 

Plus I should add the truck only has 27000 on it and besides the torque management it's completely stock

 

2004 when they went returnless is when the external filter went away.

Does the truck react the same way when the tune loaded is completely stock?

 

Yes the truck actually acted up with the stock tune, did the tune to see if it would help but no luck, worse part is no check engine light so not sure where to start

 

You have checked fuel pressure or no. That's a place to start when no code is thrown. Scantool software wouldn't hurt either. You could see what everything is doing when it starts stumbling.

 

Yeah I'm waiting for a buddy with a snap on scanner to get back into town and I'm gonna get it checked out but wanted to see if anyone else has had this problem or similar