Misfire #2 Cylinder.

1.8 Liter ,. It Runs Fine In Idle In Park And Neutral. When You Apply Load (drive Occassionally) Or A/c It Start To Run Rough Itermitently.  If You Try To Floor It , It Bogs Downs And Bucks But Will Eventually Goes. If You Baby It Is Able To Go With A Little Hesitation Noticed. With Ac On It Is Very Hard To Get Going From Dead Stop But Will Go If You Go Gently With Gas. I Have Repalced Fuel Filter .plugs,wires, Injectors,tps ,iac,fuel Reg,cleaned Throttle Body,. I Have Swapped In Test Coil For Both (one At Time ). What Am I Missing. No Other Codes Show Up?once It Gets Going There Is No Hesitation Noticed. Just Mainly At Take Off And With Ac As Biggest Stumble. . But Will Stumble Aslo As I Said Without Ac On From Dead Stop. If You Are In Park Just Reving Engine Will Get Stumble Or Bog Dowm. Thanks For Any Help.