Started off had a misfire on cylinders 2 and 8. Replaced all plugs and wires. Brand new distributor and replaced every sensor possible. Dine compression check and needless it was bad on cylinders 2 and 8. So I pulled engine and rebuilt completely. EVERYTHING is brand new. Put back in the truck and I have checked 400 times over and everything is plugged back in correctly. No vacuum leaks and timing is perfect. I drive it down the road around 10 miles and engine light comes on saying misfire on cylinders 2 and 7. I 've checked everything possible. Any suggestions before I roll it down the hill and bury it???