99 350 Vortec
 

New member here with a rough running problem.
my 99 Tahoe has been giving my fits for a couple years and no one can help my find a solution to the problem. It has always started great and Idles great. It runs down the road great over 45 MPH but its problem lies in Acceleration. from a dead stop it stumbles just like an old carbed engine with a bad accelerator pump but once its above 35 to 45 it accelerates great.