LT1-LT4 Modifications - Breaking Up After 5K RPM

Guys, I need some input on this problem. I am having some bad break up after 5K RPM under load and in park. I have an after market tach with a shift light. The tach signal is hooked to my MSD box. The shift light flashes when its breaking up at 5K and it is set to light up at 6K. The MSD is set to 6200. Opti is new, plugs wires and MSD are new. Fuel pump is new Racetronix with wire kit. I logged a run with DataMaster if anyone wants to see it. No codes have been thrown!

Any ideas???

:mad:

Guys, I need some input on this problem. I am having some bad break up after 5K RPM under load and in park. I have an after market tach with a shift light. The tach signal is hooked to my MSD box. The shift light flashes when its breaking up at 5K and it is set to light up at 6K. The MSD is set to 6200. Opti is new, plugs wires and MSD are new. Fuel pump is new Racetronix with wire kit. I logged a run with DataMaster if anyone wants to see it. No codes have been thrown!

Any ideas???

:mad:

What exactly do u mean by break up? Try taking all that gunk off...and try to feel if the break up is no longer there. Could be bad wiring...loose ground.
Swap in a stock coil to find out minus the toys.

What are you gapped at?

what do you have your msd plugged into for tach referance?