so i just swapped my new jdm b20b 99 spec with p75 head but my old b18b1 had a pr4 head and when i get on it full throttle it seems sluggish but if i ease into it it seems fine i have no check engine lights or anything popping up could it be my computer?it also kinda has a miss every once in a while its obd-2 everything thats the only problems.....maybe timing off a little?bad dizzy cap and button?

 

check the timing with a timing gun

 

where do i get a timing gun?and could it be how the distributor is set?

 

problem solved i had one wrong plug wire and the distributor timing was off thanx