i have an 89 gtu that i'm havin i guess that would be throttle issues wit... well my motor has been worked on... it's been aggresive street ported by the good fellas of aim tunin here in indy... well when i try to red line it the car just sputters and kinda dies untill i let go... can some one please help me try to fix it...

 

May be a fuel delivery problem. The modified engine could possibly need a higher delivery fuel pump, and/or larger injectors.