03 , ported blower , 2.76 ,mafia , bap , fresh plugs ,fuel filter and newer pumps. Car stays tuned up , has 80,000 miles . So about 3 weeks ago my brother and I take a road trip . About 1/2 way I am getting bored and start to beat on the car a little and it starts acting up . In 2 nd and 3 rd only . As soon as I hit 4500 r's the damn thing almost shuts of for a split second . Not all the way but enough of a stumble to put you into the windshield as I am getting on it. I have checked the inter cooler pump , plugs , bypass valve , cleaned the mass air , I am stumped . Havent really drove it in 2 weeks other than short blasts trying to figure it out . Any input would be grately appreciated !