2002 5.7 conversion van misfire helppppp

[2002conversionblue]

Hey guys I have a 2002 5.7 express conversion van I keep getting a misfire code
I changed the cap and rotor
plugs are new
coil is 3 years old

after I changed the cap and rotor code went away for about a week maybe 60 miles driven and now it’s back

car shows no rough idle
no starting hesitation
I’m at a loss trying to chase this code down

any help will be appreciated thank you

[2002conversionblue]

Code is P0351 forgot to add that

[MountainManJoe]

try the troubleshooting steps here:


https://charm.li/Chevy%20Truck/2002/Exp ... rts/P0351/