Reply to "Help... EFI Engine problems"

George, Thanks for the ideas. I have checked Fuel pressure through out the rpm range and am staying steady at 50 psi. Yes the 54 pound injectors are healthy but are ok. I upgraded to the 54 pound, but did make a few runs on the dyno with 42 pound injectors and had the exact same problem at 5000rpm. The spark plugs have been replaced during the dyno runs and I have scoped the signal to the coil but not output to the dist. I have also scoped tach output from MSD to Haltech.
Regarding pulse width and duty cycle of the injectors. I ran a datalog during the last dyno run and the moment I cross the 4900rpm mark I get erratic readings. The pulse width is jumping from a good 6ms to as much as 13ms. The duty cycle also is jumping around from 35-80%. Something is giving the ECU some strange input readings. My first thought was the tach output from the MSD to Haltech. But that has been scoped and signal is clear. Maybe the haltech itself is dying??
Any more ideas?

Thanks Toby