I Changed the Spark plugs on my cousins Max with NGK plugs and now that we started it in has rough idling, like when i lost one of my injectors. And if thats not bad enough the previous owner screwed up the starter and the teeth broke today and know has a hard time engaging. Does any one have any ideas to fix the Idle problems???? i checked all the cables and they are in all the way

 

maybe the injector enjoys irony