The hesitation/stumble wasII described was alot like I am feeling but mine lasts more than a half second maype 1and a half, but then it really does seem to wake up around 3000RPM and it does pull really well. It doesnt sound like its missing.

one time during that little hesitation period going over a hill during a test driv it stalled out but gave me no trouble starting back up. I think it is getting too much fuel to eraly in the RPM range?

I think I might start looking for a set of 390s.

thanks, will