89 Turbo II missing above 4k
 

Hi, I have a 89 Turbo II w/ street port, 750's cc secondaries and a HKS F-con, when the car feels like it, its starts to mist above 4500-6k rpm. I already changed the leading, trailing coils and the crank angle sensor, none makes a difference. I will be inspecting/adding new grounds to the engine also will check resistance on the cable out of the alternator. If I could have a some feedback from some of you I would appreciate it. The engine has less than 2k miles and the car will be for sale soon but I would like to feel the full power b/4 I let it go.

Thank you in advance,
Jimmy
89 TII