ambmech8

I have recently replaced a motor with a long block (5.0 ho). Got it tuned up, when I start it it idles real good then about 2 to 3 minutes later is slowly idles down to the point of dying. I have checked all vacuum hoses, new injectors, cleaned IAC. Help!!

86 5.0L

seems to be a prolem with my 5.0 too, I'm pretty sure its a vacuum leak, did you check under the intake manifold?

Twisted

Does it keep running if you give it some throttle? If not, I'd suspect a fuel problem.

AdderMk2

disconnect the IAC, if your car stalls out and falls on its face... your idle is set too low