I cant not find a 22mm stubby wrench at any harware store around where i live. I need to fix this problem soon. It seems to be getting worse and taking longer to start and sounding bad once it does almost a backfire noise and it emits a lot of exhaust............Should i just take it to the shop? I am not mechanically inclined much, but a very easy leaner. Also, i do not know what many of the terms of the engine parts mean. My list of servicing only includes oil changes, pcv valve and new* as of this weekend fuel filter repalced........need help please......

if possible respond in beginners terms or with pics if possible.......

Thank you
John