sugtions on misfire

[rickmac]

hi guys have a little prob i hope you can help

96 silverado 350 injected122000miles aprox

seems to have developed a misfire on start up when hot all sounds right havent done any checks yet

but plugs are pritty new and leeds as well

i will try some injector cleaner and check / clean plugs may be new ones

i have a suspision its a burnt valve but cant see why it goes away when hot

truck does stand idle most of the time

thanks in advance for any help or sugestions

[txab]

I'd take a look at the intake gaskets, checking for leaks.

[rickmac]

plastic manifold do they have that problem

[alz]

Maybe ohm out the plug wires. I just had one go bad all of a sudden. At first it was intermittent, then constant.

[txab]

plastic manifold do they have that problem

 

 

Yes they do. Many have had to replace the intake gaskets. Since you have the problem cold and not when hot, intake is one thing I would look at.

[Coolmaker]

Check the coil.. ;)

[rickmac]

how do i check inlet gasket do i

spray carb leaner around edge and see if engine speeds up or