96 k1500 5.7 misfire on cold start

[rickmac]

hi all i have thought my truck had a misfire for some time but couldent realy tell but has got worse on cold start up but gets better when engine is warmplugs and leeds are newish

inlet gasket has been sugested is this the gasket from lower manifold to heads and how can it be tested or have i just got to get it changed

how difficult is it to change gaskets

also can i set ignishion timeing with my obd11 reader it reads at 12deg at moment book says +or -

[GMstrong]

Make sure the plugs are gapped right.Also did you do the cap,rotor?lower intake manifold gasket is the one that sits on the heads.No its not that had just do it on the weekend so you have time to do it right.You can spray carb cleaner along the intake manifold gasket and see if it rasies the rpms.Is it hard starting?

[jaredlucky16]

The intake gaskets could be leaking coolant into and take runner causing it to soak the plugs and misfire. I even had one hydrolock the engine