93 Toyota 3.0 V6

So I have a 93 4runner I'm trying to get on the road. Motor had blown HG and some smart guy figured why not just pull the hole motor out. Then he set it to the side and didnt have the money to fix it. Left the motor out in the elements without heads on the block. So I found a used 3.0 and started over. New everything on the motor. Even changed out the exhaust manifolds to the long headers. Got the motor done about 3 years ago and had some personal stuff come up and had to set it to the side. Well I'm just getting back to the truck. Got the exhaust done on the today and I have 4 cylinders miss firing. The motor starts no problem but only running on 2 cylinders. Not sure on where to start. I have checked under the cap. Looks good. Have spark coming out of the cap to the wires. One crazy thing is that when I pull a plug wire off and I set it to the side and put my had and the map sensor it shocks me. I have look around and checked the wires but dont see anything that looks like it's broken or crossing. Going to pull plunges and see if I have spark at them. Any help would be nice. Thanks

Sry for the miss spelling. I dont ever proof read until it's too late. Lol story of my life.