OK, I think about everyone knows my story. JDM built block, ported heads, secret squirrel grind turbo cams, turbo kit, wtf ever. OK, Started the truck for the first time last night and it idled quite a bit rough, just kinda wrote it off to the tune. Started adjusting the tune tonight and still couldnt get away from the super sucky idle. The only way I can get the truck to start is to give it quite a bit of gas and hold it above 1500 rpm. After I do that for a few minutes, I can slowly ease off the accelerator and let the truck run. When I get completely off the pedal, the truck either immediately dies (most of the time) or once it ran for a minute or so. Surging intently from 600 rpm to 1200 rpm. When it would drop down to 600 it would pull about 19 on the vac gauge, then when it surged up to keep running, it would jump to about 10. Any ideas on something to look for? Already checked the IAC to make sure it was engaging, checked all the main vac lines, made sure the MAF was functioning correctly. Im baffled on this one, and I know its a difficult question to field via computer, but Im open to ideas.
Matt
Matt