brianbajnauth

I have a 87 trans am with a ls swap in it. It was a stock ls1 and then I decided to turbo it and added a tubro (precision 76mm)
After the turbo I decided to install 317 heads to bump up the boost a little. After the head swap 2 nights ago I started it up and It runs really rough at cold start. When warmed up it runs fairly smooth but every 10 mins or so the computer would lean the AFR out. I can see that's it's leaning out on my wide band, also at cold start the engine runs verry lean!
Also seen on the wideband.
I do not have my rmp gauge hooked up because I'm waiting on a tune.
I also have a mail-in tune from hawks third gen. ( the people I bought the turbo from)

What do you guy suggest I should look for? And ideas?

SPRAYED 01

iTrader: (22)

Check the basics especially a vacuum leak. Look over your spark plug wires and fuel pressure

brianbajnauth

Thanks for the respond!
Checked everything once over. 60 psi of fuel. And I don't think it's a spark problems because it would be consistent. Wouldn't it?

forcd ind

iTrader: (7)

I guess you lowered comp., which prob changed where it idles (KPA) and now it needs a tune based on fuel requirements for that area