Engine/Transmission (1994 - 1998) '95 white smoke & missing at 2600 RPM

[DKRCH]

My '95 with 5 speed starts to miss at 2600RPM and puts out white smoke (unburn't fuel smell). This is also the max RPM. I had the timing checked it is ok. The compression is around 350 PSI. The injectors were pulled and were all checked ok. The engine runs great up to this RPM with 24 PSI boost. The engine has 215 injectors and a 14 cm exhaust housing with stock muffler and pipes. I also run propane injection on hills. Any ideas or history of this problem? The engine has 100,000 miles on it. The problem is present without the propane.

 

[GOlsen]

Do you have a GSK installed? You won't really get above those RPMs without one.

 

[DKRCH]

No GSK. Max RPM for years was 3000 with no white smoke. The engine would just limit the fuel. Now I create these clouds of white smoke at this lower RPM.