I uninstalled my Crawford plenum and still intake. After that my ran fine then I noticed that when at idle my car will drop like 200 rpms and start to wabble then it goes back to normal idle after like 15 seconds then 30 seconds later it will do it again! I reset the ecu... Any ideas?

 

you have a leak just check your bolts

 

Yea, sounds like a leak.....recheck all your connections and tork on the
plenum. Start at the filter and work you way thru the intake and then
plenum and gasket.