i rebulit my lt1 its nothing wild its bored 30 over new rods speed pro coated pistons. comp 304 cam new comp roller lifters.stock intake
stock rockers.svo 24 pound injectors .stock tb .accel opisprak
summit wires .all new sensors all of them. first started it up it sounded great ran super smothe then i shut it off and started back up and it started to run rough . scanned it no codes hesitates just off idel then
it pulls really hard to 5500 and runs geat at hwy speed iam getting about
22 miles per gallon . but it idels rough at just under 1000 rpm replaced all
vacuume lines no help.sprayed intake and no leaks .did i change enough
that this need to be tuned to fix this any help would be great
thanks

 

Are you running a stock tune? Also give a look at all your plug wires make sure they aren't burnt or scored from a pulley or the headers. I would think it would run a little rough down low with a 304 cam and #24's and a stock tune.

 

sounds like you are running a stock tune.

 

i found out what was cause the rough idle it was the vacume pump

 

You may want to get it tuned aswell, or atleast I would for a cam swap, .030 over.