GSR4U2NV

after removing my MSD ignition system and just running stock ignition and even after replacing the ignitor, car cuts in/out but only after i beat on it. on the highway while im at half throttle it completely cuts out (car doesnt shut off) but its as though theres a major hesitation and then it cuts back in after a few seconds or so......what could the problem be? car always starts up fine ...and very very rarely does it die while im at a stop or something. could it be the MFR? coil? ignitor? should i try out another new ignitor since the one im using could be screwed due to the fact that it was the same one i used with the MSD digital 6 system?

GSR4U2NV

anybody?