My engine was running well except for a slight rythmic drop in RPMs. I had noticed that there was a strong gas smell when starting and I had a hot start issue. I sent my injectors off to be cleaned and two of them were stuck due to being dirty. I've reinstalled the cleaned injectors and now the engine surges when I start it. I can't find any vacuum leaks. I adjusted the idle screw about 1/8 of a turn either way (replugging the hole after the turns to make sure there are no leaks) and there was no difference in the surging. There is an engine knock too. What should I check? Spark plug wires to make sure something didn't get knocked loose? What else?