[12Ounce]

Well, of course the code is most important. If it turns out to be a "lean" code, I would recommend the following as a low-cost first step:
Lubricate on each end, with gobs of petroleum jelly, any hose/tube that connects to the intake manifold ... the brake booster supply, the PCV tube, the evap supply, etc, etc. A lot of ills can be cured with petroleum jelly.

Of course you may have to open up the intake ... not hard to do.. 14 screws for the top piece. From here you can clean the EGR ports ... and sum up the isolator bolts.