Misfire/Rough idle

I have a 99 Grand Cherokee. Recently I replaced the head gasket and took
the head to the shop for valve job and resurface job. While in there I
replaced the Lifters, Push rods, rocker arms, timing chain, water pump,
Spark plugs, and radiator. After getting it all back together there seems to be
a misfire and it runs rough. No check engine light unless I drive it for about 5
miles. The check engine light came on and was for multiple misfire, and
misfire cylinder 4 and 6. Since that time I have replaced the injectors,fuel
filter, crank Position sensor, I checked the injector plugs with a noid light, No
problems, I checked the coil pack with spark tester, No problems. I
rechecked the time gears, and they appear to be lined up. I did a
compression test and #3 was at about 135, and all other cylinders were at
150. I'm not sure what else to check.