i just got done replacing the head gaskets on my 94 ta.
it ran well for about 5 miles, and now i have a misfire.

it pops through the exhaust like a flat cam lobe. it does it at idle and gets worse as you give it gas.

i readjusted the valves, checked the firing order and made sure all plug wires were on the plugs. no difference.
i then pulled the plugs and all 4 on the driver side bank were black soot fouled. so im guessing running too rich?

will a bad o2 sensor cause that bank to run rich? i have a broken ground wire on the o2. im thinking the computer is dumping too much fuel into that bank and not the other.
pass side looks like it was burning nice.

i did have cylinders 1 and 3 injector plugs backwards, and switched them around.

so with switching the injector plugs to where they need to go, adjusting the valves, and cleaning the plugs, it still has a pop through the exhaust at idle.

would a bad o2 sensor cause any of this? i never had the problem before, just after. also there is no check engine light.

or what do you guys thing?

thanks.

aaron