hey everyone, looking for alittle help. i just got a Crawford upper plenum, and installed it. however, my car doesnt stay running. if i hold the gas its fine, but if it tries to idle it dies. could it have anything to do with the fact that four of the 6 screw holes from the origional dont have anything in them?

 

yea, you have to plug those holes up

 

what should i use to plug them? just short bolts?