idling problem

[robmick60]

hi,thanks to those who responded to my last request,but i have still have a problem with  my 1999,156 2.0 ts,its idling very eractically even with a new air flow metre sensor,i've also changed the coil packs around with a spare set i have , i did have a problem with the injector light coming on before i changed the air flow sensor but that now has gone out,while the engine was running i pulled off number 1 electric plug that feeds the power to the coil pack and the engine ran even worst so i plugged back in and it ran better, now i did that to each coil pack from left to right 2&3 never made a difference in how the car was running but 4 did as number 1 did ran like crap until i put the electric plug back in. should they all make a difference as each one is unplugged?anybody got an idea before i spend to much money on replacing sensors or switches ect? thanks for any help.