If it does need a tune up, i reconmend getting that first, and also do a fuel filter too while your at it if you have not done so.
After all that, then i would consider the IMRC and the intake runners....and its not like your wasting money, since you need to do it any ways.
If your short on time though, by all means check the IMRC connection where it connects to the runners.
Theres little white tabs, that can fall out and cause half of your runners to not open.
Lupe
