RAYMAN!
Welcome to our humble little club!
What color Q do you have... Sounds pretty nice.....
Before I continue... Are you aware of the TIMING GUIDES?? If not, please visit our articles section or goto
http://www.q45.org (me/jesda's website) and read our articles there..... IF they are not address your engine will fail...... Not to scare you or anything
ANyway, what it sounds like to me is a bad injector(s)... Basically does it just shake?? I fits really bad there may be more than one going bad....
For your parts, talk to Joe at everythinginfiniti.. 18882165328, ask for Joe, tell him your a NICO member (and say you know Wes )
It depends what you mean by "tuneup"... We have plugs for sale on Q45.org, youll see it..
Email me and I will set you up with a repair manual.....