1996 G.M.C. 5.7 vortec SLT
John, and anyone please chim in. This vehicle has a po306
code very briefly on start up. goes away when warm. about
5 mins. comes back again for a few seconds when hot. noticable stumble both times. Will not always set a code
but you will hear it stumble and feel it when driving.
G.M. says an injector problem. They were all changed. Ign.
system, ok. pump pressure ok, voltage ok, Leak down test ok, compression ok, does not over heat. This truck has the two piece manifold aluminum and plastic. Isn't this vehical
also subject to manifold leaks like the smaller vortecs ?
Truck is not mine and it is not here for me to see. problem has been going on for some time. Nevers gets better
never gets worse. #6 plug will show some black fouling.
Entire ignition system has been gone through and obvious
parts changed out. Well guys, or gals. What do you think ?