bad miss when going around corner

i got a bad miss when i turn left..... its like a dead miss. i also get this miss somtimes when im crusing along at idle..... ive done plugs last week and replaceed my TFI module..... maybe cap and roter or wires...... it misses real bad when i go around a left hand corner.... why does it only do it in a left hand corner... i fig if it was an ign. part, like plugs or wires it would do it all the time..........

any help

ok thanks. i'll try that first.....