alright i have a 2006 chevy cobalt ls, it has a custom turbo setup 50mm t3/t4 turbo, turbotech racing intake manifold, 39# injectors, open downpipe, trifecta tuned. ok i changed the oil and pressure sending unit to help my oil pressure issue it was pretty low. i got that out of the way and then i put it all back together, now im getting a lean misfire all the sudden i put everything back together perfect chack all the wire clips like 5 times, first thought it was spark, got new plugs,ICM nothing then i did some reserch and ppl said the first 02 sensor goes out, and i had a innovote wideband i just bought so i addapted it into my harness and got it connected into the first o2 bung hole on my downpipe. now i can see its a lean misfire it stars up fine for like 30 seconds then starts to misfire pretty bad it reads a a/f ratio of 14.1-15.1 at start then at misfire it gets to around 18.1-20.1 i have no clue whats going on i didnt do anything besides that maintenance to try to get it running and change the feed from the head to the block. please help if u have any info as to what it could be. i have talked to my local tuner i sent him some data logs of the start up and misfires and he cant find anything he says just looking for someone to point me in the right direction

 

Could be your timing

 

Not timing I never did anything to the motor it ran fine before the disesemble its really irratateing so I doubt its the timing but I hate issues like this

 

Found out it was a leak around the intake manifold the Flange was warped it had a bad vaccine leak