thanks for your advice..... the engine is D15Z1... nothing special... it has to be the computer. i am getting the ecu for that engine friday i hope. we will see if that works. do i need the egr or not. i would like to run a bigger intake manifold if possible but if i have to use the egr vavle then i will have to use my stock manifold.... it seemed to bog down when i but the larger intake manifold on and had all the vacume hoses hooked up but when we took them off it idled smoother.....