O2??
 

Ok heres the deal can an o2 sensor cause a really bad miss.....i put new plugs and wires on my car....and it ran great for aobut 20mins then it starts popping and missing real bad....changed plugs again samething took one of the plugs out and im running rich on the passenger side and lean on the drivers side.....i had to splice the drivers side o2 in because i got the wires trapped in between motor and transmission...could an 02 cause this problem....thanks