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

 

Code is P0351 I forgot to add that

 

Have you tried a new PCM?

​​​while I hate to advocate for the parts cannon, that would be a next part to buy.

Or, try swapping plug wires between cylinders to see if the error follows