Hello. I need help with my silverado. It has an lq4/lq9 shortblock, ls3 heads, l92 truck intake manifold, professional products throttle body, and a Voo-Doo cam. Cam specs are 212/218 .531"/.531 113lsa.

Here's the issue. I can be cruising along and need to give it throttle to accelerate with part throttle it seems to bog momentarily the catches itself and does fine. If I start from a dead stop and just accelerate normal its fine. If I punch it from a dead stop it pulls like it should. If I try to do a burn out with it; it won't. Acts like something's holding it back. It's got a new gm maf and map. Fuel pump was replaced about 2 1/2 years ago from gm. Is tuned by a very good tuner in the local area. Any idea's? Thanks. Ben

 

Honestly it sounds like a tune issue.

 

How much TM was left in your tune?

 

I'm not sure on the timing, but when we watch the parameters they show that they are good. It's kinda got the tuner stumped.

 

Did he calibrate for the larger TB??? There is a spec in tune for the TB Size that has to be increased for a larger TB.