Originally Posted by
joecar
After swapping plug wires and testing, let us know what happens.
Thinking out loud:
Firing order is: 1-8-7-2 6-5-4-3
you see misfires on #4 and #7... these two cylinders are paired (they move up/down together) and use the same sector of the CKP reluctor;
I would visually inspect the CKP relector (I know, it's hard to get an eyeball to it);
do you have access to an oscilloscope to look at CKP signal...?
Other stuff to try:
Swap inectors #4 and #7 with say #5 and #8, see if the misfirew move or stay on #4 and #7.
Can you do a leakdown test...? I would say compression test for #2 and #4 appears within range, but now I'm wondering is this 10 psi drop has a cause.