Cobra swap issues

[Jay_SVT]

Ok guys, I’m hoping I’m posting this in the right area this is my first post. so here’s the setup and issue. I did the mark viii swap on my 98 GT and I used the cobra intake manifold and all that stuff. Used the GT computer and modified harness to fit and used GT injectors and MAF. The thing drives freaking amazing. However, I have one issue and it’s only on cold starts. I can crank it once and it cranks and nothing. Crank it again and it almost fires. Crank it again and it fires and then dies. And then crank it again and it fires up and stays on and runs perfect. Then I won’t have issue again unless it cools down completely. Not sure if a tune will fix this?

 

[mysteed]

Sounds like a lack of fuel pressure based on your symptoms as if either the fuel injectors are leaking down or the anti drain back for the pump is not holding fuel in the lines.

 

[Jwilso53]

Tune