First thing i will ask is what was wrong with the last vaporizor? Codes??? E-38?? What is the fuel pressure coming out of the vaporizor now,is it around 4.5 PSI?? You say it frosts up,is there suffecient coolant in the system to get thru the vaporizor,good coolant flow thru it also???
I would take the injector and injector holder off and clean them out good(tar,debris),also clean the "last chance" screen this gets plugged with tar and debris especially after a vaporizor lets go.
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