[DeTomaso] New Carb - high idle

[Erik Anderson]

Hello all. 

I recently installed a Holley 670 Street Avenger carb. My cat fireed up right away and maintained a decent idle (with no adjustments to the carb) after she warmed up; however, when I drive and then come to a stop, the RPM's stay up in the 1600-2000 range before slowly dropping down the the normal 800 at stop idle (after 20 seconds or so). 

I plan to fiddle around with the float levels and idle mix screws today, but I am wondering if this could also be caused by a vaccum leak. 

Any opinions?

Thanks,
EA 
#3528